| discolor | (verb) change color, often in an undesired manner | Synonyms: color, colour, discolour |
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| (verb) lose color or turn colorless | - |
| (verb) cause to lose or change color | - |
| discriminator | (noun) a person who (or that which) differentiates | Synonyms: differentiator |
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| disfavor | (noun) an inclination to withhold approval from some person or group | Synonyms: disapproval, disfavour, dislike |
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| (noun) the state of being out of favor | Synonyms: disfavour |
| (verb) put at a disadvantage; hinder, harm | Synonyms: disadvantage, disfavour |
| dishonor | (noun) lacking honor or integrity | Synonyms: dishonour |
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| (noun) a state of shame or disgrace | Synonyms: dishonour |
| (verb) refuse to accept | Synonyms: dishonour |
| (verb) bring shame or dishonor upon | Synonyms: attaint, disgrace, dishonour, shame |
| (verb) force (someone) to have sex against their will | Synonyms: assault, dishonour, outrage, rape, ravish, violate |
| disinfector | (noun) an apparatus for applying disinfectants. | - |
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| disseminator | (noun) someone who spreads the news | Synonyms: propagator |
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| dissimulator | (noun) a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives | Synonyms: dissembler, hypocrite, phoney, phony, pretender |
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| distributor | (noun) electrical device that distributes voltage to the spark plugs of a gasoline engine in the order of the firing sequence | Synonyms: distributer, electrical distributor |
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| (noun) a company that markets merchandise | - |
| (noun) someone who markets merchandise | Synonyms: distributer |
| (noun) a person with authority to allot or deal out or apportion | Synonyms: allocator |
| divisor | (noun) the number by which a dividend is divided | - |
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| (noun) one of two or more integers that can be exactly divided into another integer | Synonyms: factor |
| doctor | (noun) children take the roles of physician or patient or nurse and pretend they are at the physician's office | - |
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| (noun) a licensed medical practitioner | Synonyms: doc, Dr., MD, medico, physician |
| (noun) a person who holds Ph.D. degree (or the equivalent) from an academic institution | Synonyms: Dr. |
| (verb) give medical treatment to | - |
| (verb) alter and make impure, as with the intention to deceive | Synonyms: doctor up, sophisticate |
| (verb) restore by replacing a part or putting together what is torn or broken | Synonyms: bushel, fix, furbish up, mend, repair, restore, touch on |
| dolor | (noun) (poetry) painful grief | Synonyms: dolour |
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| donor | (noun) person who makes a gift of property | Synonyms: bestower, conferrer, giver, presenter |
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| (noun) (medicine) someone who gives blood or tissue or an organ to be used in another person (the host) | - |
| door | (noun) a swinging or sliding barrier that will close the entrance to a room or building or vehicle | - |
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| (noun) the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close | Synonyms: doorway, room access, threshold |
| (noun) a room that is entered via a door | - |
| (noun) a structure where people live or work (usually ordered along a street or road) | - |
| (noun) anything providing a means of access (or escape) | - |
| duplicator | (noun) apparatus that makes copies of typed, written or drawn material | Synonyms: copier |
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| editor | (noun) (computer science) a program designed to perform such editorial functions as rearrangement or modification or deletion of data | Synonyms: editor program |
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| (noun) a person responsible for the editorial aspects of publication; the person who determines the final content of a text (especially of a newspaper or magazine) | Synonyms: editor in chief |
| educator | (noun) someone who educates young people | Synonyms: pedagog, pedagogue |
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| effector | (noun) an organ (a gland or muscle) that becomes active in response to nerve impulses | - |
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| (noun) a nerve fiber that terminates on a muscle or gland and stimulates contraction or secretion | - |
| (noun) one who brings about a result or event; one who accomplishes a purpose | Synonyms: effecter |
| ejaculator | (noun) a speaker who utters a sudden exclamation | - |
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| (noun) a man who ejaculates semen | - |
| ejector | (noun) a mechanism in a firearm that ejects the empty shell case after firing | Synonyms: cartridge ejector |
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| (noun) An injector, ejector, steam ejector, steam injector, eductor-jet pump or thermocompressor is a type of pump. | Synonyms: eductor-jet pump, injector, steam ejector, steam injector, thermocompressor |
| (noun) a person who ousts or supplants someone else | Synonyms: ouster |
| elector | (noun) a citizen who has a legal right to vote | Synonyms: voter |
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| elevator | (noun) lifting device consisting of a platform or cage that is raised and lowered mechanically in a vertical shaft in order to move people from one floor to another in a building | Synonyms: lift |
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| (noun) the airfoil on the tailplane of an aircraft that makes it ascend or descend | - |
| eliminator | (noun) an agent that eliminates something | - |
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| emancipator | (noun) someone who frees others from bondage | Synonyms: manumitter |
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| embassador | (noun) a diplomat of the highest rank; accredited as representative from one country to another | Synonyms: ambassador |
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| emperor | (noun) large richly colored butterfly | Synonyms: emperor butterfly |
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| (noun) large moth of temperate forests of Eurasia having heavily scaled transparent wings | Synonyms: emperor moth, Saturnia pavonia |
| (noun) red table grape of California | - |
| (noun) the male ruler of an empire | - |
| emptor | (noun) a person who buys | Synonyms: buyer, purchaser, vendee |
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| emulator | (noun) someone who copies the words or behavior of another | Synonyms: ape, aper, copycat, imitator |
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| enamor | (verb) attract; cause to be enamored | Synonyms: becharm, beguile, bewitch, captivate, capture, catch, charm, enamour, enchant, entrance, fascinate, trance |
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| endeavor | (noun) earnest and conscientious activity intended to do or accomplish something | Synonyms: attempt, effort, endeavour, try |
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| (noun) a purposeful or industrious undertaking (especially one that requires effort or boldness) | Synonyms: endeavour, enterprise |
| (verb) attempt by employing effort | Synonyms: endeavour, strive |
| enteroceptor | (noun) any receptor that responds to stimuli inside the body | Synonyms: interoceptor |
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| enumerator | (noun) someone who collects census data by visiting individual homes | Synonyms: census taker |
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| eoraptor | (noun) a theropod dinosaur of the genus Eoraptor | - |
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| epilator | (noun) a cosmetic for temporary removal of undesired hair | Synonyms: depilator, depilatory |
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| equator | (noun) an imaginary line around the Earth forming the great circle that is equidistant from the north and south poles | - |
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| (noun) a circle dividing a sphere or other surface into two usually equal and symmetrical parts | - |
| equivocator | (noun) a respondent who avoids giving a clear direct answer | Synonyms: hedger, tergiversator |
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| eradicator | (noun) someone who exterminates (especially someone whose occupation is the extermination of troublesome rodents and insects) | Synonyms: exterminator, terminator |
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| error | (noun) a wrong action attributable to bad judgment or ignorance or inattention | Synonyms: fault, mistake |
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| (noun) (baseball) a failure of a defensive player to make an out when normal play would have sufficed | Synonyms: misplay |
| (noun) inadvertent incorrectness | Synonyms: erroneousness |
| (noun) departure from what is ethically acceptable | Synonyms: wrongdoing |
| (noun) a misconception resulting from incorrect information | Synonyms: erroneous belief |
| (noun) part of a statement that is not correct | Synonyms: mistake |
| (noun) (computer science) the occurrence of an incorrect result produced by a computer | Synonyms: computer error |
| escalator | (noun) a stairway whose steps move continuously on a circulating belt | Synonyms: moving staircase, moving stairway |
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| (noun) a clause in a contract that provides for an increase or a decrease in wages or prices or benefits etc. depending on certain conditions (as a change in the cost of living index) | Synonyms: escalator clause |
| estimator | (noun) an expert at calculation (or at operating calculating machines) | Synonyms: calculator, computer, figurer, reckoner |
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| evaluator | (noun) an authority who is able to estimate worth or quality | Synonyms: judge |
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| excavator | (noun) a machine for excavating | Synonyms: digger, power shovel, shovel |
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| (noun) a workman who excavates for foundations of buildings or for quarrying | - |
| excelsior | (noun) thin curly wood shavings used for packing or stuffing | Synonyms: wood shavings |
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| excogitator | (noun) a thinker who considers carefully and thoroughly | - |
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| executor | (noun) a person appointed by a testator to carry out the terms of the will | - |
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| exhibitor | (noun) someone who organizes an exhibit for others to see | Synonyms: exhibitioner, shower |
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| expectorator | (noun) a medicine promoting expectoration | Synonyms: expectorant |
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| (noun) a person who spits (ejects saliva or phlegm from the mouth) | Synonyms: spitter |
| expositor | (noun) a person who explains | Synonyms: expounder |
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| expurgator | (noun) a person who edits a text by removing obscene or offensive words or passages | Synonyms: bowdleriser, bowdlerizer |
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| extensor | (noun) a skeletal muscle whose contraction extends or stretches a body part | Synonyms: extensor muscle |
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| exterior | (adjective) situated in or suitable for the outdoors or outside of a building | - |
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| (noun) the outer side or surface of something | Synonyms: outside |
| (noun) the region that is outside of something | Synonyms: outside |
| exterminator | (noun) someone who exterminates (especially someone whose occupation is the extermination of troublesome rodents and insects) | Synonyms: eradicator, terminator |
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| exteroceptor | (noun) any receptor that responds to stimuli outside the body | - |
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| extirpator | (noun) a farm implement used to remove weeds. | - |
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| extractor | (noun) an instrument for extracting tight-fitting components | - |
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| (noun) an apparatus that uses centrifugal force to separate particles from a suspension | Synonyms: centrifuge, separator |
| (noun) a mechanism in a firearm that pulls an empty shell case out of the chamber and passes it to the ejector | Synonyms: cartridge extractor, cartridge remover |
| fabricator | (noun) someone who tells lies | Synonyms: fibber, storyteller |
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| facilitator | (noun) someone who makes progress easier | - |
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| factor | (noun) (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity | Synonyms: cistron, gene |
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| (noun) an abstract part of something | Synonyms: component, constituent, element, ingredient |
| (noun) an independent variable in statistics | - |
| (noun) anything that contributes causally to a result | - |
| (noun) a businessman who buys or sells for another in exchange for a commission | Synonyms: agent, broker |
| (noun) one of two or more integers that can be exactly divided into another integer | Synonyms: divisor |
| (noun) any of the numbers (or symbols) that form a product when multiplied together | - |
| (verb) resolve into factors | Synonyms: factor in, factor out |
| (verb) consider as relevant when making a decision | Synonyms: factor in, factor out |
| (verb) be a contributing factor | - |
| favor | (noun) an act of gracious kindness | Synonyms: favour |
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| (noun) souvenir consisting of a small gift given to a guest at a party | Synonyms: favour, party favor, party favour |
| (noun) an advantage to the benefit of someone or something | Synonyms: favour |
| (noun) an inclination to approve | Synonyms: favour |
| (noun) a feeling of favorable regard | Synonyms: favour |
| (verb) consider as the favorite | Synonyms: favour |
| (verb) promote over another | Synonyms: favour, prefer |
| (verb) treat gently or carefully | Synonyms: favour |
| (verb) bestow a privilege upon | Synonyms: favour, privilege |
| fervor | (noun) feelings of great warmth and intensity | Synonyms: ardor, ardour, fervency, fervidness, fervour, fire |
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| (noun) the state of being emotionally aroused and worked up | Synonyms: excitation, excitement, fervour, inflammation |
| fetor | (noun) a distinctive odor that is offensively unpleasant | Synonyms: foetor, malodor, malodour, mephitis, reek, stench, stink |
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| flavor | (noun) the taste experience when a savoury condiment is taken into the mouth | Synonyms: flavour, nip, relish, sapidity, savor, savour, smack, tang |
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| (noun) (physics) the six kinds of quarks | Synonyms: flavour |
| (noun) the general atmosphere of a place or situation and the effect that it has on people | Synonyms: feel, feeling, flavour, look, smell, spirit, tone |
| (verb) lend flavor to | Synonyms: flavour, season |
| flexor | (noun) a skeletal muscle whose contraction bends a joint | Synonyms: flexor muscle |
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| flocculator | (noun) An apparatus used in the process of flocculation. | - |
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| floor | (noun) the inside lower horizontal surface (as of a room, hallway, tent, or other structure) | Synonyms: flooring |
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| (noun) a structure consisting of a room or set of rooms at a single position along a vertical scale | Synonyms: level, storey, story |
| (noun) a large room in a exchange where the trading is done | Synonyms: trading floor |
| (noun) the legislative hall where members debate and vote and conduct other business | - |
| (noun) the parliamentary right to address an assembly | - |
| (noun) a lower limit | Synonyms: base |
| (noun) the occupants of a floor | - |
| (noun) the bottom surface of any lake or other body of water | - |
| (noun) the ground on which people and animals move about | - |
| (noun) the lower inside surface of any hollow structure | - |
| (verb) knock down with force | Synonyms: coldcock, deck, dump, knock down |
| (verb) surprise greatly; knock someone's socks off | Synonyms: ball over, blow out of the water, shock, take aback |
| fluor | (noun) a soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine | Synonyms: fluorite, fluorspar |
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| foetor | (noun) a distinctive odor that is offensively unpleasant | Synonyms: fetor, malodor, malodour, mephitis, reek, stench, stink |
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| fornicator | (noun) someone who commits adultery or fornication | Synonyms: adulterer |
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| fryolator | (noun) A kitchen appliance for deep frying; its size depends on intended use. | Synonyms: deep fat fryer, deep fryer, frier, fryer |
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| fumigator | (noun) a device that generates a gas for the purpose of disinfecting or eradicating pests | - |
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| (noun) someone whose job is to fumigate | - |
| furor | (noun) a sudden outburst (as of protest) | Synonyms: furore |
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| (noun) an interest followed with exaggerated zeal | Synonyms: craze, cult, fad, furore, rage |
| gator | (noun) either of two amphibious reptiles related to crocodiles but with shorter broader snouts | Synonyms: alligator |
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| gearmotor | (noun) a motor combined with a set of speed-reducing gears. | - |
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| generator | (noun) engine that converts mechanical energy into electrical energy by electromagnetic induction | - |
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| (noun) an apparatus that produces a vapor or gas | - |
| (noun) an electronic device for producing a signal voltage | - |
| (noun) someone who originates or causes or initiates something | Synonyms: author, source |
| genitor | (noun) a natural father or mother | - |
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| gladiator | (noun) (ancient Rome) a professional combatant or a captive who entertained the public by engaging in mortal combat | - |
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| (noun) a professional boxer | Synonyms: prizefighter |
| glamor | (noun) alluring beauty or charm (often with sex-appeal) | Synonyms: glamour |
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| governor | (noun) a control that maintains a steady speed in a machine (as by controlling the supply of fuel) | Synonyms: regulator |
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| (noun) the head of a state government | - |
| grantor | (noun) a person who makes a grant in legal form | - |
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| granulator | (noun) a machine that forms material (such as plastics, bottles, organics, etc.) into granules. | Synonyms: granulator machine |
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| guarantor | (noun) one who provides a warrant or guarantee to another | Synonyms: surety, warranter, warrantor |
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| guvnor | (noun) (British slang) person in command | - |
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| handcolor | (verb) color by hand | Synonyms: handcolour |
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| harbor | (noun) a place of refuge and comfort and security | Synonyms: harbour |
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| (noun) a sheltered port where ships can take on or discharge cargo | Synonyms: harbour, haven, seaport |
| (verb) maintain (a theory, thoughts, or feelings) | Synonyms: bear, entertain, harbour, hold, nurse |
| (verb) hold back a thought or feeling about | Synonyms: harbour, shield |
| (verb) keep in one's possession; of animals | Synonyms: harbour |
| (verb) secretly shelter (as of fugitives or criminals) | Synonyms: harbour |
| hector | (verb) be bossy towards | Synonyms: ballyrag, boss around, browbeat, bully, bullyrag, push around, strong-arm |
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| heritor | (noun) a person who is entitled by law or by the terms of a will to inherit the estate of another | Synonyms: heir, inheritor |
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| hesitator | (noun) one who hesitates (usually out of fear) | Synonyms: hesitater, vacillator, waverer |
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| honor | (noun) the quality of being honorable and having a good name | Synonyms: honour |
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| (noun) a woman's virtue or chastity | Synonyms: honour, pureness, purity |
| (noun) a tangible symbol signifying approval or distinction | Synonyms: accolade, award, honour, laurels |
| (noun) the state of being honored | Synonyms: honour, laurels |
| (verb) accept as pay | Synonyms: honour |
| (verb) bestow honor or rewards upon | Synonyms: honour, reward |
| (verb) show respect towards | Synonyms: abide by, honour, observe, respect |
| horror | (noun) something that inspires horror; something horrible | - |
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| (noun) intense aversion | Synonyms: repugnance, repulsion, revulsion |
| (noun) intense and profound fear | - |
| humor | (noun) the quality of being funny | Synonyms: humour |
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| (noun) the trait of appreciating (and being able to express) the humorous | Synonyms: humour, sense of humor, sense of humour |
| (noun) the liquid parts of the body | Synonyms: bodily fluid, body fluid, humour, liquid body substance |
| (noun) (Middle Ages) one of the four fluids in the body whose balance was believed to determine your emotional and physical state | Synonyms: humour |
| (noun) a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter | Synonyms: humour, wit, witticism, wittiness |
| (noun) a characteristic (habitual or relatively temporary) state of feeling | Synonyms: humour, mood, temper |
| (verb) put into a good mood | Synonyms: humour |
| ichor | (noun) a fluid product of inflammation | Synonyms: festering, purulence, pus, sanies, suppuration |
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| (noun) (Greek mythology) the rarified fluid said to flow in the veins of the Gods | - |
| ignitor | (noun) a device for lighting or igniting fuel or charges or fires | Synonyms: igniter, light, lighter |
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| (noun) a substance used to ignite or kindle a fire | Synonyms: igniter, lighter |
| illustrator | (noun) an artist who makes illustrations (for books or magazines or advertisements etc.) | - |
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| imitator | (noun) someone who copies the words or behavior of another | Synonyms: ape, aper, copycat, emulator |
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| (noun) someone who (fraudulently) assumes the appearance of another | Synonyms: impersonator |
| immunosuppressor | (noun) a drug that lowers the body's normal immune response | Synonyms: immune suppressant drug, immunosuppressant, immunosuppressive, immunosuppressive drug |
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| impersonator | (noun) someone who (fraudulently) assumes the appearance of another | Synonyms: imitator |
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| impostor | (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, imposter, pretender, pseud, pseudo, role player, sham, shammer |
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| incinerator | (noun) a furnace for incinerating (especially to dispose of refuse) | - |
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| incisor | (noun) a tooth for cutting or gnawing; located in the front of the mouth in both jaws | - |
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| incubator | (noun) apparatus consisting of a box designed to maintain a constant temperature by the use of a thermostat; used for chicks or premature infants | Synonyms: brooder |
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| indicator | (noun) a device for showing the operating condition of some system | - |
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| (noun) a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time | Synonyms: index, index number, indicant |
| (noun) a signal for attracting attention | - |
| (noun) (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction | - |