| praetor | (noun) an annually elected magistrate of the ancient Roman Republic | Synonyms: pretor |
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| precentor | (noun) the musical director of a choir | Synonyms: cantor, choirmaster |
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| preceptor | (noun) teacher at a university or college (especially at Cambridge or Oxford) | Synonyms: don |
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| 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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| predictor | (noun) a computer for controlling antiaircraft fire that computes the position of an aircraft at the instant of a shell's arrival | - |
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| (noun) information that supports a probabilistic estimate of future events | - |
| (noun) someone who makes predictions of the future (usually on the basis of special knowledge) | Synonyms: forecaster, prognosticator, soothsayer |
| preemptor | (noun) a bidder in bridge who makes a preemptive bid | Synonyms: pre-emptor |
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| (noun) someone who acquires land by preemption | Synonyms: pre-emptor |
| prestidigitator | (noun) someone who performs magic tricks to amuse an audience | Synonyms: conjurer, conjuror, illusionist, magician |
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| pretor | (noun) an annually elected magistrate of the ancient Roman Republic | Synonyms: praetor |
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| prevaricator | (noun) a person who has lied or who lies repeatedly | Synonyms: liar |
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| primogenitor | (noun) an ancestor in the direct line | Synonyms: progenitor |
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| procrastinator | (noun) someone who postpones work (especially out of laziness or habitual carelessness) | Synonyms: cunctator, postponer |
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| proctor | (noun) someone who supervises (an examination) | Synonyms: monitor |
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| (verb) watch over (students taking an exam, to prevent cheating) | Synonyms: invigilate |
| 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 |
| progenitor | (noun) an ancestor in the direct line | Synonyms: primogenitor |
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| prognosticator | (noun) someone who makes predictions of the future (usually on the basis of special knowledge) | Synonyms: forecaster, predictor, soothsayer |
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| projector | (noun) an optical instrument that projects an enlarged image onto a screen | - |
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| (noun) an optical device for projecting a beam of light | - |
| 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) | - |
| proprietor | (noun) (law) someone who owns (is legal possessor of) a business | Synonyms: owner |
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| proprioceptor | (noun) special nerve endings in the muscles and tendons and other organs that respond to stimuli regarding the position and movement of the body | - |
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| prosecutor | (noun) a government official who conducts criminal prosecutions on behalf of the state | Synonyms: prosecuting attorney, prosecuting officer, public prosecutor |
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| prospector | (noun) someone who explores an area for mineral deposits | - |
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| protector | (noun) a person who cares for persons or property | Synonyms: defender, guardian, shielder |
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| protractor | (noun) drafting instrument used to draw or measure angles | - |
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| psychomotor | (adjective) of or relating to or characterizing mental events that have motor consequences or vice versa | - |
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| purificator | (noun) a white linen cloth which is used to wipe the chalice after each communicant partakes. | Synonyms: emunctorium, purificatorium |
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| quaestor | (noun) any of several public officials of ancient Rome (usually in charge of finance and administration) | - |
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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 | - |
| raptor | (noun) any of numerous carnivorous birds that hunt and kill other animals | Synonyms: bird of prey, raptorial bird |
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| ratiocinator | (noun) someone who reasons logically | Synonyms: reasoner |
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| reactor | (noun) (physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements | Synonyms: nuclear reactor |
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| (noun) an electrical device used to introduce reactance into a circuit | - |
| receptor | (noun) an organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation | Synonyms: sense organ, sensory receptor |
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| (noun) a cellular structure that is postulated to exist in order to mediate between a chemical agent that acts on nervous tissue and the physiological response | - |
| rector | (noun) a person authorized to conduct religious worship | Synonyms: curate, minister, minister of religion, parson, pastor |
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| redactor | (noun) someone who puts text into appropriate form for publication | Synonyms: redact, reviser, rewrite man, rewriter |
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| reenactor | (noun) a person who enacts a role in an event that occurred earlier | - |
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| reflector | (noun) device that reflects radiation | - |
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| (noun) optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece | Synonyms: reflecting telescope |
| 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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| 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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| 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 | - |
| ruminator | (noun) a reflective thinker characterized by quiet contemplation | Synonyms: muller, muser, ponderer |
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| sartor | (noun) a person whose occupation is making and altering garments | Synonyms: seamster, tailor |
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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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| 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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| 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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| 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 |
| 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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| 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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| 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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| suitor | (noun) a man who courts a woman | Synonyms: suer, wooer |
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| 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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| 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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| 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 | - |
| 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 |
| 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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| transistor | (noun) a semiconductor device capable of amplification | Synonyms: electronic transistor, junction transistor |
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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 |
| trustor | (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: settlor |
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| turbogenerator | (noun) generator consisting of a steam turbine coupled to an electric generator for the production of electric power | - |
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