| nozzle | (noun) a projecting spout from which a fluid is discharged | Synonyms: nose |
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| (noun) informal terms for the nose | Synonyms: beak, honker, hooter, schnoz, schnozzle, snoot, snout |
| nubble | (noun) a small lump or protuberance | Synonyms: nub |
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| nucleole | (noun) a small round body of protein in a cell nucleus; such organelles contain RNA and are involved in protein synthesis | Synonyms: nucleolus |
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| nybble | (noun) a small byte | Synonyms: nibble |
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| obstacle | (noun) an obstruction that stands in the way (and must be removed or surmounted or circumvented) | - |
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| (noun) something immaterial that stands in the way and must be circumvented or surmounted | Synonyms: obstruction |
| octosyllable | (noun) a verse line having eight syllables or a poem of octosyllabic lines | - |
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| oenophile | (noun) someone who appreciates wine | Synonyms: enophile |
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| omeprazole | (noun) antacid (trade name Prilosec) that suppresses acid secretion in the stomach | Synonyms: Prilosec |
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| omphalocele | (noun) protrusion of the intestine and omentum through a hernia in the abdominal wall near the navel; usually self correcting after birth | Synonyms: umbilical hernia |
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| oracle | (noun) a shrine where an oracular god is consulted | - |
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| (noun) a prophecy (usually obscure or allegorical) revealed by a priest or priestess; believed to be infallible | - |
| (noun) an authoritative person who divines the future | Synonyms: prophesier, prophet, seer, vaticinator |
| orbitale | (noun) the craniometric point at the lowest point on the lower edge of the orbit | Synonyms: orbital point |
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| organelle | (noun) a specialized part of a cell; analogous to an organ | Synonyms: cell organ, cell organelle |
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| oriole | (noun) American songbird; male is black and orange or yellow | Synonyms: American oriole, New World oriole |
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| (noun) mostly tropical songbird; the male is usually bright orange and black | Synonyms: Old World oriole |
| oscheocele | (noun) swelling of the scrotum | Synonyms: oscheocoele |
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| oscheocoele | (noun) swelling of the scrotum | Synonyms: oscheocele |
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| ossicle | (noun) a small bone; especially one in the middle ear | Synonyms: bonelet, ossiculum |
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| ostiole | (noun) a small pore especially one in the reproductive bodies of certain algae and fungi through which spores pass | - |
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| outsole | (noun) the outer sole of a shoe or boot that is the bottom of the shoe and makes contact with the ground | - |
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| ovule | (noun) a small or immature ovum | - |
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| (noun) a small body that contains the female germ cell of a plant; develops into a seed after fertilization | - |
| packsaddle | (noun) a saddle for pack animals to which loads can be attached | - |
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| paddle | (noun) a short light oar used without an oarlock to propel a canoe or small boat | Synonyms: boat paddle |
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| (noun) an instrument of punishment consisting of a flat board | - |
| (noun) a blade of a paddle wheel or water wheel | - |
| (noun) small wooden bat with a flat surface; used for hitting balls in various games | - |
| paedophile | (noun) an adult who is sexually attracted to children | Synonyms: pedophile |
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| paigle | (noun) early spring flower common in British isles having fragrant yellow or sometimes purple flowers | Synonyms: cowslip, Primula veris |
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| (noun) Eurasian primrose with yellow flowers clustered in a one-sided umbel | Synonyms: oxlip, Primula elatior |
| pale | (noun) a wooden strip forming part of a fence | Synonyms: picket |
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| panhandle | (noun) the handle of a pan | - |
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| (noun) a relatively narrow strip of land projecting from some larger area | - |
| panicle | (noun) compound raceme or branched cluster of flowers | - |
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| pantile | (noun) a roofing tile with a S-shape; laid so that curves overlap | - |
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| papule | (noun) a small inflamed elevation of skin that is nonsuppurative (as in chicken pox) | - |
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| papulovesicle | (noun) a papule that changes into a blister | Synonyms: vesicopapule |
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| parable | (noun) a short moral story (often with animal characters) | Synonyms: allegory, apologue, fable |
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| (noun) (New Testament) any of the stories told by Jesus to convey his religious message | - |
| paradiddle | (noun) the sound of a drum (especially a snare drum) beaten rapidly and continuously | Synonyms: drum roll, roll |
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| parole | (noun) (law) a conditional release from imprisonment that entitles the person to serve the remainder of the sentence outside the prison as long as the terms of release are complied with | - |
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| (noun) a promise | Synonyms: word, word of honor |
| (noun) a secret word or phrase known only to a restricted group | Synonyms: countersign, password, watchword, word |
| participle | (noun) a non-finite form of the verb; in English it is used adjectivally and to form compound tenses | Synonyms: participial |
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| particle | (noun) a function word that can be used in English to form phrasal verbs | - |
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| (noun) a body having finite mass and internal structure but negligible dimensions | Synonyms: subatomic particle |
| (noun) (nontechnical usage) a tiny piece of anything | Synonyms: atom, corpuscle, molecule, mote, speck |
| pastille | (noun) a medicated lozenge used to soothe the throat | Synonyms: cough drop, pastil, troche |
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| pastorale | (noun) a musical composition that evokes rural life | Synonyms: idyl, idyll, pastoral |
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| payable | (noun) a liability account showing how much is owed for goods and services purchased on credit | Synonyms: account payable |
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| pebble | (noun) a small smooth rounded rock | - |
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| pedicle | (noun) a small stalk bearing a single flower of an inflorescence; an ultimate division of a common peduncle | Synonyms: pedicel |
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| pedophile | (noun) an adult who is sexually attracted to children | Synonyms: paedophile |
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| peduncle | (noun) a bundle of myelinated neurons joining different parts of the brain | Synonyms: cerebral peduncle |
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| (noun) stalk bearing an inflorescence or solitary flower | - |
| (noun) the thin process of tissue that attaches a polyp to the body | - |
| peephole | (noun) a hole (in a door or an oven etc) through which you can peep | Synonyms: eyehole, spyhole |
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| pellicle | (noun) thin protective membrane in some protozoa | - |
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| pennoncelle | (noun) a small pennant borne on a lance | Synonyms: pennoncel, penoncel |
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| pennywhistle | (noun) an inexpensive fipple flute | Synonyms: tin whistle, whistle |
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| pentacle | (noun) a star with 5 points; formed by 5 straight lines between the vertices of a pentagon and enclosing another pentagon | Synonyms: pentagram, pentangle |
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| pentangle | (noun) a star with 5 points; formed by 5 straight lines between the vertices of a pentagon and enclosing another pentagon | Synonyms: pentacle, pentagram |
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| penuchle | (noun) a card game played with a pack of forty-eight cards (two of each suit for high cards); play resembles whist | Synonyms: bezique, pinochle, pinocle |
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| people | (noun) (plural) any group of human beings (men or women or children) collectively | - |
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| (noun) the body of citizens of a state or country | Synonyms: citizenry |
| (noun) members of a family line | - |
| (noun) the common people generally | Synonyms: hoi polloi, mass, masses, multitude, the great unwashed |
| percale | (noun) a fine closely woven cotton fabric | - |
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| percentile | (noun) (statistics) any of the 99 numbered points that divide an ordered set of scores into 100 parts each of which contains one-hundredth of the total | Synonyms: centile |
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| perishable | (noun) food that will decay rapidly if not refrigerated | Synonyms: spoilable |
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| peristyle | (noun) a colonnade surrounding a building or enclosing a court | - |
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| periwinkle | (noun) edible marine gastropod | Synonyms: winkle |
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| (noun) small edible marine snail; steamed in wine or baked | Synonyms: winkle |
| (noun) chiefly trailing poisonous plants with blue flowers | - |
| (noun) commonly cultivated Old World woody herb having large pinkish to red flowers | Synonyms: Cape periwinkle, Catharanthus roseus, cayenne jasmine, Madagascar periwinkle, old maid, red periwinkle, rose periwinkle, Vinca rosea |
| pesthole | (noun) a breeding ground for epidemic disease | - |
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| pestle | (noun) a club-shaped hand tool for grinding and mixing substances in a mortar | - |
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| (noun) a heavy tool of stone or iron (usually with a flat base and a handle) that is used to grind and mix material (as grain or drugs or pigments) against a slab of stone | Synonyms: muller, pounder |
| (noun) machine consisting of a heavy bar that moves vertically for pounding or crushing ores | Synonyms: stamp |
| petiole | (noun) the slender stem that supports the blade of a leaf | Synonyms: leafstalk |
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| petiolule | (noun) the stalk of a leaflet | - |
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| phyle | (noun) a tribe of ancient Athenians | - |
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| pickle | (noun) vegetables (especially cucumbers) preserved in brine or vinegar | - |
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| (noun) informal terms for a difficult situation | Synonyms: fix, hole, jam, kettle of fish, mess, muddle |
| piddle | (noun) liquid excretory product | Synonyms: pee, piss, urine, water, weewee |
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| piffle | (noun) trivial nonsense | Synonyms: balderdash, fiddle-faddle |
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| pigeonhole | (noun) a small compartment | Synonyms: cubbyhole |
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| (noun) a specific (often simplistic) category | - |
| pile | (noun) a nuclear reactor that uses controlled nuclear fission to generate energy | Synonyms: atomic pile, atomic reactor, chain reactor |
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| (noun) battery consisting of voltaic cells arranged in series; the earliest electric battery devised by Volta | Synonyms: galvanic pile, voltaic pile |
| (noun) the yarn (as in a rug or velvet or corduroy) that stands up from the weave | Synonyms: nap |
| (noun) a column of wood or steel or concrete that is driven into the ground to provide support for a structure | Synonyms: piling, spile, stilt |
| (noun) fine soft dense hair (as the fine short hair of cattle or deer or the wool of sheep or the undercoat of certain dogs) | Synonyms: down |
| (noun) a collection of objects laid on top of each other | Synonyms: agglomerate, cumulation, cumulus, heap, mound |
| (noun) a large sum of money (especially as pay or profit) | Synonyms: big bucks, big money, bundle, megabucks |
| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, mountain, muckle, passel, peck, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad |
| pimple | (noun) a small inflamed elevation of the skin; a pustule or papule; common symptom in acne | Synonyms: hickey, zit |
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| pineapple | (noun) large sweet fleshy tropical fruit with a terminal tuft of stiff leaves; widely cultivated | Synonyms: ananas |
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| (noun) a tropical American plant bearing a large fleshy edible fruit with a terminal tuft of stiff leaves; widely cultivated in the tropics | Synonyms: Ananas comosus, pineapple plant |
| pinhole | (noun) a small puncture that might have been made by a pin | - |
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| pinnacle | (noun) (architecture) a slender upright spire at the top of a buttress or tower | - |
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| (noun) a lofty peak | - |
| (noun) the highest level or degree attainable; the highest stage of development | Synonyms: acme, elevation, height, meridian, peak, summit, superlative, tiptop, top |
| pinnule | (noun) division of a usually pinnately divided leaf | Synonyms: pinna |
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| pinochle | (noun) a card game played with a pack of forty-eight cards (two of each suit for high cards); play resembles whist | Synonyms: bezique, penuchle, pinocle |
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| pinocle | (noun) a card game played with a pack of forty-eight cards (two of each suit for high cards); play resembles whist | Synonyms: bezique, penuchle, pinochle |
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| pinole | (noun) meal made of finely ground corn mixed with sugar and spices | - |
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| pintle | (noun) a pin or bolt forming the pivot of a hinge | - |
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| pipistrelle | (noun) small European brown bat | Synonyms: pipistrel, Pipistrellus pipistrellus |
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| plughole | (noun) a hole into which a plug fits (especially a hole where water drains away) | - |
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| plumule | (noun) down feather of young birds; persists in some adult birds | - |
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| pole | (noun) a long (usually round) rod of wood or metal or plastic | - |
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| (noun) one of the two ends of a magnet where the magnetism seems to be concentrated | Synonyms: magnetic pole |
| (noun) a long fiberglass sports implement used for pole vaulting | - |
| (noun) a contact on an electrical device (such as a battery) at which electric current enters or leaves | Synonyms: terminal |
| (noun) one of two divergent or mutually exclusive opinions | - |
| (noun) one of two antipodal points where the Earth's axis of rotation intersects the Earth's surface | - |
| (noun) one of two points of intersection of the Earth's axis and the celestial sphere | Synonyms: celestial pole |
| (noun) a linear measure of 16.5 feet | Synonyms: perch, rod |
| (noun) a square rod of land | Synonyms: perch, rod |
| polypropenonitrile | (noun) acrylic resin used to make a strong soft crease-resistant fabric (trade name Acrilan) | Synonyms: Acrilan |
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| polysyllable | (noun) a word of more than three syllables | Synonyms: polysyllabic word |
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| poodle | (noun) an intelligent dog with a heavy curly solid-colored coat that is usually clipped; an old breed sometimes trained as sporting dogs or as performing dogs | Synonyms: poodle dog |
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| popsicle | (noun) ice cream or water ice on a small wooden stick | Synonyms: ice lolly, lollipop, lolly |
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| porbeagle | (noun) voracious pointed-nose shark of northern Atlantic and Pacific | Synonyms: Lamna nasus |
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| portable | (noun) a small light typewriter; usually with a case in which it can be carried | - |
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| porthole | (noun) a window in a ship or airplane | - |
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| (noun) an opening (in a wall or ship or armored vehicle) for firing through | Synonyms: embrasure, port |
| possible | (noun) something that can be done | - |
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| (noun) an applicant who might be suitable | - |
| posthole | (noun) a hole dug in the ground to hold a fence post | Synonyms: post hole |
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| potable | (noun) any liquid suitable for drinking | Synonyms: beverage, drink, drinkable |
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| potamogale | (noun) amphibious African insectivorous mammal that resembles an otter | Synonyms: otter shrew, Potamogale velox |
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| pothole | (noun) a pit or hole produced by wear or weathering (especially in a road surface) | Synonyms: chuckhole |
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| pottle | (noun) a pot that holds 2 quarts | - |
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| pratincole | (noun) Old World shorebird with long pointed wings and short legs; closely related to the coursers | Synonyms: glareole |
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| prattle | (noun) idle or foolish and irrelevant talk | Synonyms: blether, chin music, idle talk, prate |
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| preamble | (noun) a preliminary introduction to a statute or constitution (usually explaining its purpose) | - |
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| prickle | (noun) a small sharp-pointed tip resembling a spike on a stem or leaf | Synonyms: pricker, spikelet, spine, sticker, thorn |
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| principle | (noun) a basic truth or law or assumption | - |
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| (noun) a rule or standard especially of good behavior | - |
| (noun) (law) an explanation of the fundamental reasons (especially an explanation of the working of some device in terms of laws of nature) | Synonyms: rationale |
| (noun) a basic generalization that is accepted as true and that can be used as a basis for reasoning or conduct | Synonyms: rule |
| (noun) a rule or law concerning a natural phenomenon or the function of a complex system | Synonyms: rule |
| (noun) rule of personal conduct | Synonyms: precept |
| probable | (noun) an applicant likely to be chosen | - |
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| proctocele | (noun) protrusion or herniation of the rectum into the vagina; can occur if pelvic muscles are weakened by childbirth | Synonyms: rectocele |
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| profile | (noun) biographical sketch | - |
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| (noun) an analysis (often in graphical form) representing the extent to which something exhibits various characteristics | - |
| (noun) a vertical section of the Earth's crust showing the different horizons or layers | - |
| (noun) an outline of something (especially a human face as seen from one side) | - |
| (noun) degree of exposure to public notice | Synonyms: visibility |
| profiterole | (noun) a small hollow pastry that is typically filled with cream and covered with chocolate | - |
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| projectile | (noun) a weapon that is forcibly thrown or projected at a targets but is not self-propelled | Synonyms: missile |
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| (noun) any vehicle self-propelled by a rocket engine | Synonyms: rocket |