| numerator | (noun) the dividend of a fraction | - |
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| obliterator | (noun) an eliminator that does away with all traces | - |
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| observatory | (noun) a building designed and equipped to observe astronomical phenomena | - |
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| (noun) a structure commanding a wide view of its surroundings | Synonyms: lookout, lookout station, observation tower |
| obturator | (noun) a prosthesis used to close an opening (as to close an opening of the hard palate in cases of cleft palate) | - |
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| operator | (noun) an agent that operates some apparatus or machine | Synonyms: manipulator |
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| (noun) someone who owns or operates a business | - |
| (noun) a shrewd or unscrupulous person who knows how to circumvent difficulties | Synonyms: hustler, wheeler dealer |
| (noun) a speculator who trades aggressively on stock or commodity markets | - |
| (noun) (mathematics) a symbol or function representing a mathematical operation | - |
| orator | (noun) a person who delivers a speech or oration | Synonyms: public speaker, rhetorician, speechifier, speechmaker |
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| oratorio | (noun) a musical composition for voices and orchestra based on a religious text | Synonyms: cantata |
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| oratory | (noun) addressing an audience formally (usually a long and rhetorical address and often pompous) | - |
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| orchestrator | (noun) an arranger who writes for orchestras | - |
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| originator | (noun) someone who creates new things | Synonyms: conceiver, mastermind |
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| oscillator | (noun) generator that produces sonic oscillations or alternating current | - |
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| osculator | (noun) someone who kisses | Synonyms: kisser |
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| peculator | (noun) someone who violates a trust by taking (money) for his own use | Synonyms: defalcator, embezzler |
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| penetrator | (noun) an intruder who passes into or through (often by overcoming resistance) | - |
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| perambulator | (noun) a small vehicle with four wheels in which a baby or child is pushed around | Synonyms: baby buggy, baby carriage, carriage, go-cart, pram, pushchair, pusher, stroller |
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| percolator | (noun) a coffeepot in which boiling water ascends through a central tube and filters back down through a basket of ground coffee beans | - |
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| perpetrator | (noun) someone who perpetrates wrongdoing | Synonyms: culprit |
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| photocoagulator | (noun) surgical instrument containing a laser for use in photocoagulation | - |
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| pollinator | (noun) an insect that carries pollen from one flower to another | - |
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| postulator | (noun) someone who assumes or takes something for granted as the basis of an argument | - |
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| (noun) (Roman Catholic Church) someone who proposes or pleads for a candidate for beatification or canonization | - |
| precipitator | (noun) removes dust particles from gases by electrostatic precipitation | Synonyms: Cottrell precipitator, electrostatic precipitator |
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| predator | (noun) any animal that lives by preying on other animals | Synonyms: predatory animal |
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| (noun) someone who attacks in search of booty | Synonyms: marauder, piranha, vulture |
| predicator | (noun) an expression that predicates | - |
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| prestidigitator | (noun) someone who performs magic tricks to amuse an audience | Synonyms: conjurer, conjuror, illusionist, magician |
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| prevaricator | (noun) a person who has lied or who lies repeatedly | Synonyms: liar |
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| procrastinator | (noun) someone who postpones work (especially out of laziness or habitual carelessness) | Synonyms: cunctator, postponer |
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| procurator | (noun) (ancient Rome) someone employed by the Roman Emperor to manage finance and taxes | - |
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| (noun) a person authorized to act for another | Synonyms: placeholder, proxy |
| prognosticator | (noun) someone who makes predictions of the future (usually on the basis of special knowledge) | Synonyms: forecaster, predictor, soothsayer |
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| promulgator | (noun) (law) one who promulgates laws (announces a law as a way of putting it into execution) | - |
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| pronator | (noun) a muscle that produces or assists in pronation | - |
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| propagator | (noun) someone who spreads the news | Synonyms: disseminator |
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| (noun) someone who propagates plants (as under glass) | - |
| purgatory | (noun) (theology) in Roman Catholic theology the place where those who have died in a state of grace undergo limited torment to expiate their sins | - |
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| (noun) a temporary condition of torment or suffering | - |
| purificator | (noun) a white linen cloth which is used to wipe the chalice after each communicant partakes. | Synonyms: emunctorium, purificatorium |
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| purificatorium | (noun) a white linen cloth which is used to wipe the chalice after each communicant partakes. | Synonyms: emunctorium, purificator |
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| radiator | (noun) a mechanism consisting of a metal honeycomb through which hot fluids circulate; heat is transferred from the fluid through the honeycomb to the airstream that is created either by the motion of the vehicle or by a fan | - |
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| (noun) heater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildings | - |
| (noun) any object that radiates energy | - |
| ratiocinator | (noun) someone who reasons logically | Synonyms: reasoner |
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| reformatory | (noun) correctional institution for the detention and discipline and training of young or first offenders | Synonyms: reform school, training school |
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| refrigerator | (noun) white goods in which food can be stored at low temperatures | Synonyms: icebox |
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| regulator | (noun) any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc. | - |
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| (noun) a control that maintains a steady speed in a machine (as by controlling the supply of fuel) | Synonyms: governor |
| (noun) an official responsible for control and supervision of a particular activity or area of public interest | - |
| remunerator | (noun) a person who pays money for something | Synonyms: payer |
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| renovator | (noun) a skilled worker who is employed to restore or refinish buildings or antique furniture | Synonyms: preserver, refinisher, restorer |
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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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| ruminator | (noun) a reflective thinker characterized by quiet contemplation | Synonyms: muller, muser, ponderer |
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| salutatorian | (noun) a graduating student with the second highest academic rank; may deliver the opening address at graduation exercises | Synonyms: salutatory speaker |
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| salutatory | (noun) an opening or welcoming statement (especially one delivered at graduation exercises) | Synonyms: salutatory address, salutatory oration |
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| sanatorium | (noun) a hospital for recuperation or for the treatment of chronic diseases | Synonyms: sanatarium, sanitarium |
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| (noun) pejorative terms for an insane asylum | Synonyms: Bedlam, booby hatch, crazy house, cuckoo's nest, funny farm, funny house, loony bin, madhouse, nut house, nuthouse, snake pit |
| satori | (noun) (Zen Buddhism) a state of sudden spiritual enlightenment | - |
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| segregator | (noun) someone who believes the racial groups should be kept apart | Synonyms: segregationist |
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| selenator | (noun) A fan of Selena Gomez | - |
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| senator | (noun) a member of a senate | - |
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| senatorship | (noun) the office of senator | - |
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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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| signatory | (noun) someone who signs and is bound by a document | Synonyms: signer |
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| simulator | (noun) a machine that simulates an environment for the purpose of training or research | - |
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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 | - |
| 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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| steatorrhea | (noun) the presence of greater than normal amounts of fat in the feces which are frothy and foul smelling and floating; a symptom of disorders of fat metabolism and malabsorption syndrome | - |
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| sternutator | (noun) a chemical substance that causes sneezing and coughing and crying | Synonyms: sternutatory |
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| sternutatory | (noun) a chemical substance that causes sneezing and coughing and crying | Synonyms: sternutator |
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| subjugator | (noun) a conqueror who defeats and enslaves | - |
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| sudatorium | (noun) a bathhouse for hot air baths or steam baths | Synonyms: sudatory |
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| sudatory | (noun) a bathhouse for hot air baths or steam baths | Synonyms: sudatorium |
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| (noun) a medicine that causes or increases sweating | Synonyms: sudorific |
| supinator | (noun) a muscle (especially in the forearm) that produces or assists in supination | - |
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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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| 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 |
| 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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| testator | (noun) a person who makes a will | Synonyms: testate |
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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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| 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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| 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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| translator | (noun) a program that translates one programming language into another | Synonyms: translating program |
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| (noun) someone who mediates between speakers of different languages | Synonyms: interpreter |
| (noun) a person who translates written messages from one language to another | Synonyms: transcriber |
| turbogenerator | (noun) generator consisting of a steam turbine coupled to an electric generator for the production of electric power | - |
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| urinator | (noun) a person who urinates | Synonyms: pisser |
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| vaccinator | (noun) a medical practitioner who inoculates people against diseases | Synonyms: inoculator |
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| vacillator | (noun) one who hesitates (usually out of fear) | Synonyms: hesitater, hesitator, waverer |
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| valuator | (noun) one who estimates officially the worth or value or quality of things | Synonyms: appraiser |
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| vasodilator | (noun) a drug that causes dilation of blood vessels | Synonyms: vasodilative |
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| vaticinator | (noun) an authoritative person who divines the future | Synonyms: oracle, prophesier, prophet, seer |
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| venerator | (noun) someone who regards with deep respect or reverence | - |
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| ventilator | (noun) a device (such as a fan) that introduces fresh air or expels foul air | - |
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| (noun) a device that facilitates breathing in cases of respiratory failure | Synonyms: breathing apparatus, breathing device, breathing machine |
| vesicatory | (noun) a chemical agent that causes blistering (especially mustard gas) | Synonyms: vesicant |
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| vibrator | (noun) mechanical device that produces vibratory motion; used for massage | - |
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| (noun) a mechanical device that vibrates | - |
| vindicator | (noun) a person who argues to defend or justify some policy or institution | Synonyms: apologist, justifier |
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| violator | (noun) someone who assaults others sexually | Synonyms: debaucher, ravisher |
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| (noun) someone who violates the law | Synonyms: law offender, lawbreaker |
| vociferator | (noun) a loud and vehement speaker (usually in protest) | - |
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