| 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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| numerable | (adjective) that can be counted | Synonyms: countable, denumerable, enumerable |
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| nuzzle | (verb) rub noses | Synonyms: nose |
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| (verb) dig out with the snout | - |
| (verb) move or arrange oneself in a comfortable and cozy position | Synonyms: cuddle, draw close, nest, nestle, snuggle |
| nybble | (noun) a small byte | Synonyms: nibble |
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| objectionable | (adjective) causing disapproval or protest | Synonyms: obnoxious |
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| (adjective) liable to objection or debate; used of something one might take exception to | Synonyms: exceptionable |
| obliterable | (adjective) able to be obliterated completely | Synonyms: removable |
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| observable | (adjective) capable of being seen or noticed | Synonyms: discernible, evident |
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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 |
| obtainable | (adjective) capable of being obtained | Synonyms: getable, gettable, procurable |
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| octosyllable | (noun) a verse line having eight syllables or a poem of octosyllabic lines | - |
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| octuple | (adjective) having eight units or components | Synonyms: eight-fold, eightfold |
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| oenophile | (noun) someone who appreciates wine | Synonyms: enophile |
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| offsaddle | (verb) remove the saddle from | Synonyms: unsaddle |
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| ogle | (verb) look at with amorous intentions | Synonyms: perv, perve |
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| omeprazole | (noun) antacid (trade name Prilosec) that suppresses acid secretion in the stomach | Synonyms: Prilosec |
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| omissible | (adjective) capable of being left out | - |
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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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| operable | (adjective) capable of being treated by surgical operation | - |
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| (adjective) usable for a specific purpose | Synonyms: practicable |
| (adjective) fit or ready for use or service | Synonyms: functional, operational, usable, useable |
| opposable | (adjective) capable of being placed opposite to something | Synonyms: apposable |
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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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| ostensible | (adjective) represented or appearing as such; pretended | Synonyms: ostensive |
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| (adjective) appearing as such but not necessarily so | Synonyms: apparent, seeming |
| 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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| overrule | (verb) rule against | Synonyms: override, overthrow, overturn, reverse |
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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 | - |
| oxidizable | (adjective) capable of undergoing a chemical reaction with oxygen | - |
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| packable | (adjective) capable of being packed | - |
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| 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 | - |
| (verb) stir with a paddle | - |
| (verb) give a spanking to; subject to a spanking | Synonyms: larrup, spank |
| (verb) propel with a paddle | - |
| (verb) swim like a dog in shallow water | - |
| (verb) walk unsteadily, with short steps | Synonyms: coggle, dodder, toddle, totter, waddle |
| (verb) play in or as if in water, as of small children | Synonyms: dabble, splash around |
| 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 |
| paintable | (adjective) lending itself to being painted | - |
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| palatable | (adjective) acceptable to the taste or mind | Synonyms: toothsome |
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| pale | (adjective) abnormally deficient in color as suggesting physical or emotional distress | Synonyms: pallid, wan |
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| (adjective) lacking in vitality or interest or effectiveness | Synonyms: pallid |
| (adjective) very light colored; highly diluted with white | - |
| (adjective) not full or rich | - |
| (adjective) (of light) lacking in intensity or brightness; dim or feeble | Synonyms: pallid, sick, wan |
| (noun) a wooden strip forming part of a fence | Synonyms: picket |
| (verb) turn pale, as if in fear | Synonyms: blanch, blench |
| palpable | (adjective) capable of being perceived; especially capable of being handled or touched or felt | Synonyms: tangible |
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| (adjective) so intense as to be almost touched or felt | - |
| (adjective) clearly revealed to the mind or the senses or judgment | Synonyms: apparent, evident, manifest, patent, plain, unmistakable |
| (adjective) (medicine) can be felt by palpation | - |
| panhandle | (noun) the handle of a pan | - |
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| (noun) a relatively narrow strip of land projecting from some larger area | - |
| (verb) beg by accosting people in the street and asking for money | - |
| 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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| pardonable | (adjective) admitting of being pardoned | - |
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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 |
| (verb) release a criminal from detention and place him on parole | - |
| partible | (adjective) (of e.g. property) capable of being parted or divided | - |
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| 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 |
| passable | (adjective) able to be passed or traversed or crossed | - |
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| (adjective) about average; acceptable | Synonyms: adequate, fair to middling, tolerable |
| 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 | (adjective) subject to or requiring payment especially as specified | Synonyms: collectable, collectible |
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| (noun) a liability account showing how much is owed for goods and services purchased on credit | Synonyms: account payable |
| peaceable | (adjective) not disturbed by strife or turmoil or war | Synonyms: peaceful |
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| (adjective) disposed to peace or of a peaceful nature | Synonyms: pacific |
| (adjective) inclined or disposed to peace | Synonyms: peace-loving |
| pebble | (noun) a small smooth rounded rock | - |
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| peccable | (adjective) liable to sin | Synonyms: peccant |
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| peddle | (verb) sell or offer for sale from place to place | Synonyms: hawk, huckster, monger, pitch, vend |
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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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| penetrable | (adjective) admitting of penetration or passage into or through | - |
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| (adjective) capable of being penetrated | - |
| penile | (adjective) of or relating to the penis | Synonyms: penial |
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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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| pensionable | (adjective) entitled to receive a pension | - |
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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 |
| (verb) fill with people | - |
| (verb) furnish with people | - |
| percale | (noun) a fine closely woven cotton fabric | - |
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| perceivable | (adjective) capable of being apprehended or understood | Synonyms: apprehensible, graspable, intelligible, understandable |
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| (adjective) capable of being perceived especially by sight or hearing | - |
| 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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| perceptible | (adjective) capable of being perceived by the mind or senses | - |
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| (adjective) easily seen or detected | Synonyms: detectable |
| perdurable | (adjective) very long lasting | Synonyms: durable, indestructible, undestroyable |
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| perfectible | (adjective) capable of becoming or being made perfect | - |
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| perishable | (adjective) liable to perish; subject to destruction or death or decay | - |
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| (noun) food that will decay rapidly if not refrigerated | Synonyms: spoilable |
| 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 |
| permeable | (adjective) allowing fluids or gases to pass or diffuse through | - |
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| permissible | (adjective) that may be permitted especially as according to rule | Synonyms: allowable |
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| (adjective) that may be accepted or conceded | - |
| permutable | (adjective) capable of changing sequence | Synonyms: transposable |
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| personable | (adjective) (of persons) pleasant in appearance and personality | - |
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| persuadable | (adjective) being susceptible to persuasion | Synonyms: convincible, persuasible, suasible |
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| persuasible | (adjective) being susceptible to persuasion | Synonyms: convincible, persuadable, suasible |
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| 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 |
| (verb) grind, mash or pulverize in a mortar | - |
| 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 |
| (verb) preserve in a pickling liquid | - |
| piddle | (noun) liquid excretory product | Synonyms: pee, piss, urine, water, weewee |
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| (verb) eliminate urine | Synonyms: make, make water, micturate, pass water, pee-pee, pee, piss, puddle, relieve oneself, spend a penny, take a leak, urinate, wee-wee, wee |
| (verb) waste time; spend one's time idly or inefficiently | Synonyms: piddle away, trifle, wanton, wanton away |
| piffle | (noun) trivial nonsense | Synonyms: balderdash, fiddle-faddle |
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| (verb) act in a trivial or ineffective way | - |
| (verb) speak (about unimportant matters) rapidly and incessantly | Synonyms: blab, blabber, chatter, clack, gabble, gibber, maunder, palaver, prate, prattle, tattle, tittle-tattle, twaddle |
| pigeonhole | (noun) a small compartment | Synonyms: cubbyhole |
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| (noun) a specific (often simplistic) category | - |
| (verb) treat or classify according to a mental stereotype | Synonyms: stamp, stereotype |
| (verb) place into a small compartment | - |
| 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 |
| (verb) arrange in stacks | Synonyms: heap, stack |
| (verb) place or lay as if in a pile | - |
| (verb) press tightly together or cram | Synonyms: jam, mob, pack, throng |