| northwester | (noun) a wind from the northwest | Synonyms: northwest wind |
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| nutter | (noun) a person who is regarded as eccentric or mad | Synonyms: wacko, whacko |
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| obstructer | (noun) any structure that makes progress difficult | Synonyms: impediment, impedimenta, obstruction, obstructor |
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| (noun) someone who systematically obstructs some action that others want to take | Synonyms: obstructionist, obstructor, resister, thwarter |
| octameter | (noun) a verse line having eight metrical feet | - |
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| odometer | (noun) a meter that shows mileage traversed | Synonyms: hodometer, mileometer, milometer |
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| oedometer | (noun) an instrument for measuring the rate and amount of consolidation of a soil specimen under pressure. | - |
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| ohmmeter | (noun) a meter for measuring electrical resistance in ohms | - |
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| oldster | (noun) an elderly person | Synonyms: golden ager, old person, senior citizen |
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| oleaster | (noun) any of several shrubs of the genus Elaeagnus having silver-white twigs and yellow flowers followed by olivelike fruits | - |
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| orbiter | (noun) man-made equipment that orbits around the earth or the moon | Synonyms: artificial satellite, satellite |
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| ornithopter | (noun) heavier-than-air craft that is propelled by the flapping of wings | Synonyms: orthopter |
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| orthopter | (noun) heavier-than-air craft that is propelled by the flapping of wings | Synonyms: ornithopter |
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| otter | (noun) freshwater carnivorous mammal having webbed and clawed feet and dark brown fur | - |
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| (noun) the fur of an otter | - |
| ouster | (noun) the act of ejecting someone or forcing them out | Synonyms: ousting |
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| (noun) a wrongful dispossession | - |
| (noun) a person who ousts or supplants someone else | Synonyms: ejector |
| outfitter | (noun) a shop that provides equipment for some specific purpose | - |
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| (noun) someone who sells men's clothes | - |
| overnighter | (noun) a small traveling bag to carry clothing and accessories for staying overnight | Synonyms: overnight bag, overnight case |
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| (noun) a guest who stays overnight | - |
| oximeter | (noun) a measuring instrument that measures the oxygen in arterial blood | - |
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| oyster | (noun) marine mollusks having a rough irregular shell; found on the sea bed mostly in coastal waters | - |
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| (noun) edible body of any of numerous oysters | Synonyms: huitre |
| (noun) a small muscle on each side of the back of a fowl | - |
| pacesetter | (noun) a horse used to set the pace in racing | Synonyms: pacemaker, pacer |
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| (noun) a leading instance in its field | Synonyms: pacemaker |
| painter | (noun) large American feline resembling a lion | Synonyms: catamount, cougar, Felis concolor, mountain lion, panther, puma |
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| (noun) a line that is attached to the bow of a boat and used for tying up (as when docking or towing) | - |
| (noun) an artist who paints | - |
| (noun) a worker who is employed to cover objects with paint | - |
| palmister | (noun) fortuneteller who predicts your future by the lines on your palms | Synonyms: chiromancer, palmist |
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| parachuter | (noun) a person who jumps from aircraft using a parachute | Synonyms: parachute jumper, parachutist |
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| parameter | (noun) a constant in the equation of a curve that can be varied to yield a family of similar curves | Synonyms: parametric quantity |
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| (noun) a quantity (such as the mean or variance) that characterizes a statistical population and that can be estimated by calculations from sample data | - |
| (noun) (computer science) a reference or value that is passed to a function, procedure, subroutine, command, or program | Synonyms: argument |
| (noun) any factor that defines a system and determines (or limits) its performance | - |
| paster | (noun) an adhesive label | Synonyms: gummed label, sticker |
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| (noun) a workman who pastes | - |
| pater | (noun) an informal use of the Latin word for father; sometimes used by British schoolboys or used facetiously | - |
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| paternoster | (noun) a type of lift having a chain of open compartments that move continually in an endless loop so that (agile) passengers can step on or off at each floor | - |
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| patter | (noun) plausible glib talk (especially useful to a salesperson) | Synonyms: line of gab, spiel |
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| (noun) a quick succession of light rapid sounds | - |
| paymaster | (noun) a person in charge of paying wages | - |
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| pedometer | (noun) measuring instrument for recording the number of steps taken in walking | - |
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| pelter | (noun) a thrower of missiles | - |
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| (noun) a heavy rain | Synonyms: cloudburst, deluge, downpour, soaker, torrent, waterspout |
| pelvimeter | (noun) measuring instrument for performing pelvimetry | - |
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| pentameter | (noun) a verse line having five metrical feet | - |
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| perfecter | (noun) a skilled worker who perfects something | - |
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| perimeter | (noun) the size of something as given by the distance around it | Synonyms: circumference |
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| (noun) the boundary line or the area immediately inside the boundary | Synonyms: border, margin |
| (noun) a line enclosing a plane areas | - |
| petter | (noun) a lover who gently fondles and caresses the loved one | Synonyms: fondler |
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| pewter | (noun) any of various alloys of tin with small amounts of other metals (especially lead) | - |
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| philter | (noun) a drink credited with magical power; can make the one who takes it love the one who gave it | Synonyms: love-philter, love-philtre, love-potion, philtre |
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| photometer | (noun) photographic equipment that measures the intensity of light | Synonyms: exposure meter, light meter |
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| (noun) measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source | - |
| piaster | (noun) a fractional monetary unit in Egypt and Lebanon and Sudan and Syria | Synonyms: piastre |
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| (noun) 100 kurus equal 1 lira in Turkey | Synonyms: kurus, piastre |
| picometer | (noun) a metric unit of length equal to one trillionth of a meter | Synonyms: micromicron, picometre |
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| piezometer | (noun) a measuring instrument for measuring high pressures | - |
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| pilaster | (noun) a rectangular column that usually projects about a third of its width from the wall to which it is attached | - |
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| plaiter | (noun) someone who plaits (hair or fabric etc.) | - |
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| planimeter | (noun) a measuring instrument for measuring the area of an irregular plane figure | Synonyms: integrator |
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| planter | (noun) a decorative pot for house plants | - |
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| (noun) the owner or manager of a plantation | Synonyms: plantation owner |
| (noun) a worker who puts or sets seeds or seedlings into the ground | - |
| plaster | (noun) adhesive tape used in dressing wounds | Synonyms: adhesive plaster, sticking plaster |
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| (noun) a surface of hardened plaster (as on a wall or ceiling) | Synonyms: plasterwork |
| (noun) a medical dressing consisting of a soft heated mass of meal or clay that is spread on a cloth and applied to the skin to treat inflamed areas or improve circulation etc. | Synonyms: cataplasm, poultice |
| (noun) a mixture of lime or gypsum with sand and water; hardens into a smooth solid; used to cover walls and ceilings | - |
| (noun) any of several gypsum cements; a white powder (a form of calcium sulphate) that forms a paste when mixed with water and hardens into a solid; used in making molds and sculptures and casts for broken limbs | Synonyms: plaster of Paris |
| plater | (noun) a skilled worker who coats articles with a film of metal (usually silver or gold) | - |
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| platter | (noun) a large shallow dish used for serving food | - |
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| (noun) sound recording consisting of a disk with a continuous groove; used to reproduce music by rotating while a phonograph needle tracks in the groove | Synonyms: disc, disk, phonograph record, phonograph recording, record |
| plessimeter | (noun) a small thin metal plate held against the body and struck with a plexor in percussive examinations | Synonyms: pleximeter |
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| pleximeter | (noun) a small thin metal plate held against the body and struck with a plexor in percussive examinations | Synonyms: plessimeter |
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| plotter | (noun) an instrument (usually driven by a computer) for drawing graphs or pictures | - |
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| (noun) a member of a conspiracy | Synonyms: coconspirator, conspirator, machinator |
| (noun) a planner who draws up a personal scheme of action | Synonyms: schemer |
| (noun) a clerk who marks data on a chart | Synonyms: mapper |
| pluviometer | (noun) gauge consisting of an instrument to measure the quantity of precipitation | Synonyms: rain gage, rain gauge, udometer |
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| pointer | (noun) a strong slender smooth-haired dog of Spanish origin having a white coat with brown or black patches; scents out and points to game | Synonyms: Spanish pointer |
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| (noun) an indicator as on a dial | - |
| (noun) (computer science) indicator consisting of a movable spot of light (an icon) on a visual display; moving it allows the user to point to commands or screen positions | Synonyms: cursor |
| (noun) a mark to indicate a direction or relation | Synonyms: arrow |
| polarimeter | (noun) an optical device used to measure the rotation of the plane of vibration of polarized light | Synonyms: polariscope |
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| pollster | (noun) someone who conducts surveys of public opinion | Synonyms: canvasser, headcounter, poll taker |
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| polluter | (noun) a person or organization that causes pollution of the environment | Synonyms: defiler |
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| polyester | (noun) any of a large class of synthetic fabrics | - |
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| (noun) any of numerous synthetic resins; they are light and strong and weather resistant | - |
| (noun) a complex ester used for making fibers or resins or plastics or as a plasticizer | - |
| porter | (noun) a very dark sweet ale brewed from roasted unmalted barley | Synonyms: porter's beer |
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| (noun) a person employed to carry luggage and supplies | - |
| (noun) a railroad employee who assists passengers (especially on sleeping cars) | Synonyms: Pullman porter |
| (noun) someone who guards an entrance | Synonyms: door guard, doorkeeper, doorman, gatekeeper, hall porter, ostiary |
| poster | (noun) a horse kept at an inn or post house for use by mail carriers or for rent to travelers | Synonyms: post-horse, post horse |
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| (noun) a sign posted in a public place as an advertisement | Synonyms: bill, card, notice, placard, posting |
| (noun) someone who pastes up bills or placards on walls or billboards | Synonyms: bill poster, bill sticker |
| postmaster | (noun) the person in charge of a post office | - |
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| potentiometer | (noun) a resistor with three terminals, the third being an adjustable center terminal; used to adjust voltages in radios and TV sets | Synonyms: pot |
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| (noun) a measuring instrument for measuring direct current electromotive forces | - |
| pothunter | (noun) a nonprofessional archeologist | - |
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| (noun) someone who participates in contests in order to collect trophies | - |
| (noun) someone who hunts for food (not for sport) | - |
| potter | (noun) a craftsman who shapes pottery on a potter's wheel and bakes them in a kiln | Synonyms: ceramicist, ceramist, thrower |
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| pouter | (noun) one of a breed of pigeon that enlarge their crop until their breast is puffed out | Synonyms: pouter pigeon |
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| (noun) someone with a habitually sullen or gloomy expression | Synonyms: gloomy Gus, picklepuss, sourpuss |
| prankster | (noun) someone who plays practical jokes on others | Synonyms: cut-up, hoaxer, practical joker, tricker, trickster |
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| prater | (noun) an obnoxious and foolish and loquacious talker | Synonyms: babbler, chatterbox, chatterer, magpie, spouter |
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| presbyter | (noun) an elder in the Presbyterian Church | - |
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| presenter | (noun) person who makes a gift of property | Synonyms: bestower, conferrer, donor, giver |
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| (noun) an advocate who presents a person (as for an award or a degree or an introduction etc.) | Synonyms: sponsor |
| (noun) someone who presents a message of some sort (as a petition or an address or a check or a memorial etc.) | - |
| printer | (noun) a machine that prints | Synonyms: printing machine |
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| (noun) (computer science) an output device that prints the results of data processing | - |
| (noun) someone whose occupation is printing | Synonyms: pressman |
| prizefighter | (noun) a professional boxer | Synonyms: gladiator |
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| promoter | (noun) someone who is an active supporter and advocate | Synonyms: booster, plugger |
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| (noun) a sponsor who books and stages public entertainments | Synonyms: impresario, showman |
| prompter | (noun) a device that displays words for people to read | Synonyms: autocue |
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| (noun) someone who assists a performer by providing the next words of a forgotten speech | Synonyms: theater prompter |
| protester | (noun) someone who participates in a public display of group feeling | Synonyms: demonstrator |
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| (noun) a person who dissents from some established policy | Synonyms: contestant, dissenter, dissident, objector |
| psychrometer | (noun) a hygrometer consisting of a dry-bulb thermometer and a wet-bulb thermometer; their difference indicates the dryness of the surrounding air | - |
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| punster | (noun) someone overly fond of making puns | - |
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| punter | (noun) (football) a person who kicks the football by dropping it from the hands and contacting it with the foot before it hits the ground | - |
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| (noun) someone who bets | Synonyms: better, bettor, wagerer |
| (noun) someone who propels a boat with a pole | - |
| putter | (noun) the iron normally used on the putting green | Synonyms: putting iron |
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| (noun) a golfer who is putting | - |
| pyrometer | (noun) a thermometer designed to measure high temperatures | - |
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| quarter | (noun) clemency or mercy shown to a defeated opponent | - |
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| (noun) the rear part of a ship | Synonyms: after part, poop, stern, tail |
| (noun) piece of leather that comprises the part of a shoe or boot covering the heel and joining the vamp | - |
| (noun) a district of a city having some distinguishing character | - |
| (noun) an unspecified person | - |
| (noun) a United States or Canadian coin worth one fourth of a dollar | - |
| (noun) one of four equal parts | Synonyms: fourth, fourth part, one-fourth, one-quarter, quartern, twenty-five percent |
| (noun) a quarter of a hundredweight (25 pounds) | - |
| (noun) a quarter of a hundredweight (28 pounds) | - |
| (noun) one of the four major division of the compass | - |
| (noun) one of four periods into which the school year is divided | - |
| (noun) (football, professional basketball) one of four divisions into which some games are divided | - |
| (noun) a fourth part of a year; three months | - |
| (noun) a unit of time equal to 15 minutes or a quarter of an hour | - |
| quartermaster | (noun) an army officer who provides clothing and subsistence for troops | - |
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| quester | (noun) someone making a search or inquiry | Synonyms: searcher, seeker |
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| quitter | (noun) a person who gives up too easily | - |
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| quizmaster | (noun) the host or chairman of a radio or tv quiz show or panel game | Synonyms: question master |
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| quoter | (noun) a communicator (speaker or writer) who uses quotations | - |
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| radiometer | (noun) meter to detect and measure radiant energy (electromagnetic or acoustic) | - |
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| radiomicrometer | (noun) radiometer that is extremely sensitive | - |
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| rafter | (noun) one of several parallel sloping beams that support a roof | Synonyms: balk, baulk |
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| (noun) someone who travels by raft | Synonyms: raftman, raftsman |
| ragsorter | (noun) a worker who sorts rags and old clothing for new uses (as in papermaking) | - |
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| rainwater | (noun) drops of fresh water that fall as precipitation from clouds | Synonyms: rain |
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| ranter | (noun) someone who rants and raves; speaks in a violent or loud manner | Synonyms: raver |
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| raster | (noun) the rectangular formation of parallel scanning lines that guide the electron beam on a television screen or a computer monitor | - |
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| ratter | (noun) any of several breeds of terrier developed to catch rats | Synonyms: rat terrier |
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| (noun) a disloyal person who betrays or deserts his cause or religion or political party or friend etc. | Synonyms: apostate, deserter, recreant, renegade, turncoat |
| rebutter | (noun) (law) a pleading by the defendant in reply to a plaintiff's surrejoinder | Synonyms: rebuttal |
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| (noun) a debater who refutes or disproves by offering contrary evidence or argument | Synonyms: confuter, disprover, refuter |
| reciter | (noun) someone who recites from memory | - |
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| recruiter | (noun) an official who enlists personnel for military service | - |
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| (noun) someone who supplies members or employees | - |
| reflectometer | (noun) a meter that measures the reflectance of a surface | - |
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| refractometer | (noun) measuring instrument for measuring the refractive index of a substance | - |
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| refuter | (noun) a debater who refutes or disproves by offering contrary evidence or argument | Synonyms: confuter, disprover, rebutter |
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| register | (noun) a regulator (as a sliding plate) for regulating the flow of air into a furnace or other heating device | - |
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| (noun) an air passage (usually in the floor or a wall of a room) for admitting or excluding heated air from the room | - |
| (noun) a cashbox with an adding machine to register transactions; used in shops to add up the bill | Synonyms: cash register |
| (noun) (computer science) memory device that is the part of computer memory that has a specific address and that is used to hold information of a specific kind | - |
| (noun) (music) the timbre that is characteristic of a certain range and manner of production of the human voice or of different pipe organ stops or of different musical instruments | - |
| (noun) an official written record of names or events or transactions | Synonyms: registry |
| (noun) a book in which names and transactions are listed | - |
| renter | (noun) someone who pays rent to use land or a building or a car that is owned by someone else | Synonyms: tenant |
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| (noun) an owner of property who receives payment for its use by another person | - |