| resistor | (noun) an electrical device that resists the flow of electrical current | Synonyms: resistance |
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| resonator | (noun) any system that resonates | - |
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| (noun) an electrical circuit that combines capacitance and inductance in such a way that a periodic electric oscillation will reach maximum amplitude | Synonyms: resonant circuit |
| (noun) a hollow chamber whose dimensions allow the resonant oscillation of electromagnetic or acoustic waves | Synonyms: cavity resonator, resonating chamber |
| respirator | (noun) a breathing device for administering long-term artificial respiration | Synonyms: inhalator |
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| (noun) a protective mask with a filter; protects the face and lungs against poisonous gases | Synonyms: gas helmet, gasmask |
| resuscitator | (noun) a breathing apparatus used for resuscitation by forcing oxygen into the lungs of a person who has undergone asphyxia or arrest of respiration | - |
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| retaliator | (noun) someone who takes vengeance | Synonyms: avenger |
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| retractor | (noun) surgical instrument that holds back the edges of a surgical incision | - |
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| rigor | (noun) something hard to endure | Synonyms: asperity, grimness, hardship, rigorousness, rigour, rigourousness, severeness, severity |
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| (noun) the quality of being valid and rigorous | Synonyms: cogency, rigour, validity |
| (noun) excessive sternness | Synonyms: hardness, harshness, inclemency, rigorousness, rigour, rigourousness, severeness, severity, stiffness |
| rotor | (noun) rotating mechanism consisting of an assembly of rotating airfoils | - |
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| (noun) the rotating armature of a motor or generator | Synonyms: rotor coil |
| (noun) the revolving bar of a distributor | - |
| rubor | (noun) a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat | Synonyms: inflammation, redness |
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| ruminator | (noun) a reflective thinker characterized by quiet contemplation | Synonyms: muller, muser, ponderer |
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| rumor | (noun) gossip (usually a mixture of truth and untruth) passed around by word of mouth | Synonyms: hearsay, rumour |
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| (verb) tell or spread rumors | Synonyms: bruit, rumour |
| sailor | (noun) a stiff hat made of straw with a flat crown | Synonyms: boater, leghorn, Panama, Panama hat, skimmer, straw hat |
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| (noun) any member of a ship's crew | Synonyms: crewman |
| (noun) a serviceman in the navy | Synonyms: bluejacket, navy man, sailor boy |
| salvor | (noun) someone who salvages | Synonyms: salvager |
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| sartor | (noun) a person whose occupation is making and altering garments | Synonyms: seamster, tailor |
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| savior | (noun) a person who rescues you from harm or danger | Synonyms: deliverer, rescuer, saviour |
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| savor | (noun) the taste experience when a savoury condiment is taken into the mouth | Synonyms: flavor, flavour, nip, relish, sapidity, savour, smack, tang |
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| (verb) derive or receive pleasure from; get enjoyment from; take pleasure in | Synonyms: bask, enjoy, relish, savour |
| (verb) taste appreciatively | Synonyms: savour |
| (verb) give taste to | Synonyms: savour |
| (verb) have flavor; taste of something | Synonyms: savour, taste |
| scissor | (verb) cut with or as if with scissors | - |
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| sculptor | (noun) an artist who creates sculptures | Synonyms: carver, sculpturer, statue maker |
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| secretor | (noun) any of various organs that synthesize substances needed by the body and release it through ducts or directly into the bloodstream | Synonyms: gland, secreter, secretory organ |
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| sector | (noun) measuring instrument consisting of two graduated arms hinged at one end | - |
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| (noun) a particular aspect of life or activity | Synonyms: sphere |
| (noun) a social group that forms part of the society or the economy | - |
| (noun) a portion of a military position | - |
| (noun) the minimum track length that can be assigned to store information; unless otherwise specified a sector of data consists of 512 bytes | - |
| (noun) a plane figure bounded by two radii and the included arc of a circle | - |
| segregator | (noun) someone who believes the racial groups should be kept apart | Synonyms: segregationist |
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| seignior | (noun) a man of rank in the ancient regime | Synonyms: feudal lord, seigneur |
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| selector | (noun) a switch that is used to select among alternatives | Synonyms: selector switch |
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| (noun) a person who chooses or selects out | Synonyms: chooser, picker |
| selenator | (noun) A fan of Selena Gomez | - |
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| semiconductor | (noun) a conductor made with semiconducting material | Synonyms: semiconductor device, semiconductor unit |
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| (noun) a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities | Synonyms: semiconducting material |
| senator | (noun) a member of a senate | - |
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| senior | (adjective) older; higher in rank; longer in length of tenure or service | - |
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| (adjective) used of the fourth and final year in United States high school or college | Synonyms: fourth-year |
| (adjective) advanced in years; (`aged' is pronounced as two syllables) | Synonyms: aged, elderly, older |
| (noun) an undergraduate student during the year preceding graduation | - |
| (noun) a person who is older than you are | Synonyms: elder |
| sensor | (noun) any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner | Synonyms: detector, sensing element |
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| sensorimotor | (adjective) of or relating to the sensory and motor coordination of an organism or to the controlling nerves | - |
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| separator | (noun) an apparatus that uses centrifugal force to separate particles from a suspension | Synonyms: centrifuge, extractor |
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| sequenator | (noun) (chemistry) an apparatus that can determine the sequence of monomers in a polymer | Synonyms: sequencer |
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| servitor | (noun) someone who performs the duties of an attendant for someone else | - |
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| settlor | (noun) (law) a person who creates a trust by giving real or personal property in trust to a trustee for the benefit of a beneficiary; a person who gives such property is said to settle it on the trustee | Synonyms: trustor |
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| signior | (noun) used as an Italian courtesy title; can be prefixed to the name or used separately | Synonyms: signor |
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| signor | (noun) used as an Italian courtesy title; can be prefixed to the name or used separately | Synonyms: signior |
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| simulator | (noun) a machine that simulates an environment for the purpose of training or research | - |
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| solicitor | (noun) a British lawyer who gives legal advice and prepares legal documents | - |
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| (noun) a petitioner who solicits contributions or trade or votes | Synonyms: canvasser |
| sopor | (noun) a torpid state resembling deep sleep | Synonyms: sleep |
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| spectator | (noun) a woman's pump with medium heel; usually in contrasting colors for toe and heel | Synonyms: spectator pump |
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| (noun) a close observer; someone who looks at something (such as an exhibition of some kind) | Synonyms: looker, viewer, watcher, witness |
| speculator | (noun) someone who risks losses for the possibility of considerable gains | Synonyms: plunger |
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| (noun) someone who makes conjectures without knowing the facts | - |
| splendor | (noun) a quality that outshines the usual | Synonyms: brilliancy, luster, lustre, splendour |
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| (noun) the quality of being magnificent or splendid or grand | Synonyms: brilliance, grandeur, grandness, magnificence, splendour |
| sponsor | (noun) someone who supports or champions something | Synonyms: patron, supporter |
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| (noun) an advocate who presents a person (as for an award or a degree or an introduction etc.) | Synonyms: presenter |
| (verb) assume sponsorship of | Synonyms: patronise, patronize |
| (verb) assume responsibility for or leadership of | - |
| (verb) do one's shopping at; do business with; be a customer or client of | Synonyms: buy at, frequent, patronise, patronize, shop, shop at |
| spoor | (noun) the trail left by a person or an animal; what the hunter follows in pursuing game | - |
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| squalor | (noun) sordid dirtiness | Synonyms: sordidness, squalidness |
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| stator | (noun) mechanical device consisting of the stationary part of a motor or generator in or around which the rotor revolves | Synonyms: stator coil |
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| stentor | (noun) any of several trumpet-shaped ciliate protozoans that are members of the genus Stentor | - |
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| (noun) a speaker with an unusually loud voice | - |
| sternutator | (noun) a chemical substance that causes sneezing and coughing and crying | Synonyms: sternutatory |
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| stertor | (noun) the act of snoring or producing a snoring sound | Synonyms: snore, snoring |
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| stressor | (noun) any agent that causes stress to an organism | - |
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| stridor | (noun) a whistling sound when breathing (usually heard on inspiration); indicates obstruction of the trachea or larynx | - |
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| stupor | (noun) marginal consciousness | Synonyms: grogginess, semiconsciousness, stupefaction |
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| (noun) the feeling of distress and disbelief that you have when something bad happens accidentally | Synonyms: daze, shock |
| subcontractor | (noun) someone who enters into a subcontract with the primary contractor | - |
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| subeditor | (noun) an assistant editor | - |
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| subjugator | (noun) a conqueror who defeats and enslaves | - |
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| subtractor | (noun) An electronic logic circuit for calculating the difference between two binary numbers. | - |
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| successor | (noun) a thing or person that immediately replaces something or someone | - |
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| (noun) a person who inherits some title or office | Synonyms: heir |
| (noun) a person who follows next in order | Synonyms: replacement |
| succor | (noun) assistance in time of difficulty | Synonyms: ministration, relief, succour |
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| (verb) help in a difficult situation | Synonyms: succour |
| sudor | (noun) salty fluid secreted by sweat glands | Synonyms: perspiration, sweat |
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| suitor | (noun) a man who courts a woman | Synonyms: suer, wooer |
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| superior | (adjective) written or printed above and to one side of another character | Synonyms: superscript |
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| (adjective) of or characteristic of high rank or importance | - |
| (adjective) of high or superior quality or performance | - |
| (adjective) having an orbit farther from the sun than the Earth's orbit | - |
| (adjective) (sometimes followed by `to') not subject to or influenced by | - |
| (adjective) having a higher rank | Synonyms: higher-ranking, ranking |
| (adjective) (often followed by `to') above being affected or influenced by | - |
| (noun) a character or symbol set or printed or written above and immediately to one side of another character | Synonyms: superscript |
| (noun) one of greater rank or station or quality | Synonyms: higher-up, superordinate |
| (noun) the head of a religious community | - |
| (noun) a combatant who is able to defeat rivals | Synonyms: master, victor |
| supervisor | (noun) a program that controls the execution of other programs | Synonyms: executive program, supervisory program |
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| (noun) one who supervises or has charge and direction of | - |
| supinator | (noun) a muscle (especially in the forearm) that produces or assists in supination | - |
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| suppressor | (noun) an electrical device for suppressing unwanted currents | Synonyms: suppresser |
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| (noun) a gene that suppresses the phenotypic expression of another gene (especially of a mutant gene) | Synonyms: suppresser, suppresser gene, suppressor gene |
| (noun) someone who suppresses | Synonyms: suppresser |
| surveyor | (noun) an engineer who determines the boundaries and elevations of land or structures | - |
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| (noun) someone who conducts a statistical survey | - |
| survivor | (noun) an animal that survives in spite of adversity | - |
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| (noun) one who outlives another | - |
| (noun) one who lives through affliction | Synonyms: subsister |
| suspensor | (noun) a support for the genitals worn by men engaging in strenuous exercise | Synonyms: athletic supporter, jock, jockstrap, supporter |
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| syncopator | (noun) a musician who plays syncopated jazz music (usually in a dance band) | - |
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| syndicator | (noun) a businessman who forms a syndicate | - |
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| tabor | (noun) a small drum with one head of soft calfskin | Synonyms: tabour |
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| tabulator | (noun) a calculator that keeps a record of the number of times something happens | Synonyms: counter |
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| (noun) an electromechanical machine designed to assist in summarizing information and, later, accounting. | Synonyms: tabulating machine |
| tailor | (noun) a person whose occupation is making and altering garments | Synonyms: sartor, seamster |
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| (verb) adjust to a specific need or market | Synonyms: orient |
| (verb) create (clothes) with cloth | Synonyms: sew, tailor-make |
| (verb) style and tailor in a certain fashion | Synonyms: cut |
| tandoor | (noun) a clay oven used in northern India and Pakistan | - |
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| tangor | (noun) large citrus tree having large sweet deep orange fruit that is easily peeled; widely cultivated in Florida | Synonyms: Citrus nobilis, king orange, temple orange, temple orange tree |
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| technicolor | (noun) a trademarked method of making color motion pictures | - |
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| temblor | (noun) shaking and vibration at the surface of the earth resulting from underground movement along a fault plane or from volcanic activity | Synonyms: earthquake, quake, seism |
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| tenor | (adjective) of or close in range to the highest natural adult male voice | - |
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| (adjective) (of a musical instrument) intermediate between alto and baritone or bass | - |
| (noun) the pitch range of the highest male voice | - |
| (noun) the general meaning or substance of an utterance | Synonyms: strain |
| (noun) a settled or prevailing or habitual course of a person's life | - |
| (noun) the adult male singing voice above baritone | Synonyms: tenor voice |
| (noun) an adult male with a tenor voice | - |
| tensor | (noun) any of several muscles that cause an attached structure to become tense or firm | - |
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| (noun) a generalization of the concept of a vector | - |
| tergiversator | (noun) a respondent who avoids giving a clear direct answer | Synonyms: equivocator, hedger |
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| terminator | (noun) someone who exterminates (especially someone whose occupation is the extermination of troublesome rodents and insects) | Synonyms: eradicator, exterminator |
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| terror | (noun) the use of extreme fear in order to coerce people (especially for political reasons) | - |
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| (noun) an overwhelming feeling of fear and anxiety | Synonyms: affright, panic |
| (noun) a very troublesome child | Synonyms: brat, holy terror, little terror |
| (noun) a person who inspires fear or dread | Synonyms: scourge, threat |
| testator | (noun) a person who makes a will | Synonyms: testate |
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| therefor | (adverb) (in formal usage, especially legal usage) for that or for it | - |
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| thermistor | (noun) a semiconductor device made of materials whose resistance varies as a function of temperature; can be used to compensate for temperature variation in other components of a circuit | Synonyms: thermal resistor |
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| thermocompressor | (noun) An injector, ejector, steam ejector, steam injector, eductor-jet pump or thermocompressor is a type of pump. | Synonyms: eductor-jet pump, ejector, injector, steam ejector, steam injector |
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| thermoreceptor | (noun) a sensory receptor that responds to heat and cold | - |
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| thermoregulator | (noun) a regulator for automatically regulating temperature by starting or stopping the supply of heat | Synonyms: thermostat |
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| titrator | (noun) an apparatus for performing a titration | - |
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| tor | (noun) a high rocky hill | - |
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| (noun) a prominent rock or pile of rocks on a hill | - |
| toreador | (noun) someone who fights bulls | Synonyms: bullfighter |
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| tormentor | (noun) a flat at each side of the stage to prevent the audience from seeing into the wings | Synonyms: teaser, tormenter |
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| (noun) someone who torments | Synonyms: persecutor, tormenter |
| torpor | (noun) inactivity resulting from lethargy and lack of vigor or energy | Synonyms: listlessness, torpidity, torpidness |
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| (noun) a state of motor and mental inactivity with a partial suspension of sensibility | Synonyms: torpidity |
| tortfeasor | (noun) a party who has committed a tort | Synonyms: tort-feasor |
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| totalisator | (noun) computer that registers bets and divides the total amount bet among those who won | Synonyms: pari-mutuel machine, totaliser, totalizator, totalizer |
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| totalizator | (noun) computer that registers bets and divides the total amount bet among those who won | Synonyms: pari-mutuel machine, totalisator, totaliser, totalizer |
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| tractor | (noun) a wheeled vehicle with large wheels; used in farming and other applications | - |
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| (noun) a truck that has a cab but no body; used for pulling large trailers or vans | - |
| trafficator | (noun) a blinking light on a motor vehicle that indicates the direction in which the vehicle is about to turn | Synonyms: blinker, turn indicator, turn signal |
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| traitor | (noun) someone who betrays his country by committing treason | Synonyms: treasonist |
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| (noun) a person who says one thing and does another | Synonyms: betrayer, double-crosser, double-dealer, two-timer |
| transactor | (noun) someone who conducts or carries on business or negotiations | - |
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| transferor | (noun) (law) someone who conveys a title or property to another | - |
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| transgressor | (noun) someone who transgresses; someone who violates a law or command | - |
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