| 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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| osmoreceptor | (noun) sensory end organ that responds to changes in osmotic pressure | - |
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| ovipositor | (noun) egg-laying tubular structure at the end of the abdomen in many female insects and some fishes | - |
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| pallor | (noun) unnatural lack of color in the skin (as from bruising or sickness or emotional distress) | Synonyms: achromasia, lividity, lividness, luridness, paleness, pallidness, wanness |
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| parlor | (noun) reception room in an inn or club where visitors can be received | Synonyms: parlour |
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| (noun) a room in a private house or establishment where people can sit and talk and relax | Synonyms: front room, living-room, living room, parlour, sitting room |
| pastor | (noun) a person authorized to conduct religious worship | Synonyms: curate, minister, minister of religion, parson, rector |
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| pavior | (noun) a machine for laying pavement | Synonyms: paving machine, paviour |
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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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| percussor | (noun) (medicine) a small hammer with a rubber head used in percussive examinations of the chest and in testing reflexes | Synonyms: plessor, plexor |
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| perpetrator | (noun) someone who perpetrates wrongdoing | Synonyms: culprit |
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| persecutor | (noun) someone who torments | Synonyms: tormenter, tormentor |
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| phosphor | (noun) a synthetic substance that is fluorescent or phosphorescent; used to coat the screens of cathode ray tubes | - |
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| photocoagulator | (noun) surgical instrument containing a laser for use in photocoagulation | - |
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| picador | (noun) the horseman who pricks the bull with a lance early in the bullfight to goad the bull and to make it keep its head low | - |
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| playactor | (noun) an actor who travels around the country presenting plays | Synonyms: barnstormer, play-actor, trouper |
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| plessor | (noun) (medicine) a small hammer with a rubber head used in percussive examinations of the chest and in testing reflexes | Synonyms: percussor, plexor |
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| plexor | (noun) (medicine) a small hammer with a rubber head used in percussive examinations of the chest and in testing reflexes | Synonyms: percussor, plessor |
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| pollinator | (noun) an insect that carries pollen from one flower to another | - |
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| poor | (noun) people without possessions or wealth (considered as a group) | Synonyms: poor people |
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| possessor | (noun) a person who owns something | Synonyms: owner |
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| posterior | (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, backside, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
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| (noun) a tooth situated at the back of the mouth | Synonyms: back tooth |
| 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 | - |
| 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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| precursor | (noun) something that precedes and indicates the approach of something or someone | Synonyms: forerunner, harbinger, herald, predecessor |
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| (noun) a person who goes before or announces the coming of another | Synonyms: forerunner |
| (noun) a substance from which another substance is formed (especially by a metabolic reaction) | - |
| 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 |
| predecessor | (noun) something that precedes and indicates the approach of something or someone | Synonyms: forerunner, harbinger, herald, precursor |
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| (noun) one who precedes you in time (as in holding a position or office) | - |
| 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 |
| prehensor | (noun) the anterior pair of legs of a centipede that are modified to seize prey and inject venom from the toxicognaths | - |
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| pressor | (noun) any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure | Synonyms: vasoconstrictive, vasoconstrictor |
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| 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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| prior | (noun) the head of a religious order; in an abbey the prior is next below the abbot | - |
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| processor | (noun) (computer science) the part of a computer (a microprocessor chip) that does most of the data processing | Synonyms: C.P.U., central processing unit, central processor, CPU, mainframe |
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| (noun) a business engaged in processing agricultural products and preparing them for market | - |
| (noun) someone who processes things (foods or photographs or applicants etc.) | - |
| 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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| 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 |
| professor | (noun) someone who is a member of the faculty at a college or university | Synonyms: prof |
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| 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 | - |
| promisor | (noun) a person who makes a promise | Synonyms: promiser |
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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) | - |
| propellor | (noun) a mechanical device that rotates to push against air or water | Synonyms: propeller |
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| 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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| purificator | (noun) a white linen cloth which is used to wipe the chalice after each communicant partakes. | Synonyms: emunctorium, purificatorium |
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| purveyor | (noun) someone who supplies provisions (especially food) | - |
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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 | - |
| rancor | (noun) a feeling of deep and bitter anger and ill-will | Synonyms: bitterness, gall, rancour, resentment |
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| 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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| razor | (noun) edge tool used in shaving | - |
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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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| repressor | (noun) an agent that represses | Synonyms: represser |
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| repulsor | (noun) a fictional anti-gravity device in the Star Wars Universe. | Synonyms: repulsorlift, repulsorlift engine |
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| (noun) A repulsor is either one of two drives located in the gauntlets of Iron Man's armor; they have been referred to as being magnetic, a blast of charged particles, and as a force beam. | - |
| 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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| 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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| sculptor | (noun) an artist who creates sculptures | Synonyms: carver, sculpturer, statue maker |
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