| nonessential | (noun) anything that is not essential | Synonyms: inessential |
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| nonmetal | (noun) a chemical element lacking typical metallic properties | - |
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| nonpareil | (noun) colored beads of sugar used as a topping on e.g. candies and cookies | - |
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| (noun) a flat disk of chocolate covered with beads of colored sugar | - |
| (noun) model of excellence or perfection of a kind; one having no equal | Synonyms: apotheosis, ideal, nonesuch, nonsuch, paragon, saint |
| nonremittal | (noun) loss resulting from failure of a debt to be paid | Synonyms: default, nonpayment |
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| (noun) act of failing to meet a financial obligation | Synonyms: default, nonpayment |
| nonsteroidal | (noun) an organic compound that does no contain a steroid | Synonyms: nonsteroid |
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| nopal | (noun) any of several cacti of the genus Nopalea resembling prickly pears | - |
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| (noun) cactus having yellow flowers and purple fruits | Synonyms: Opuntia lindheimeri |
| norethynodrel | (noun) a progesterone derivative used in oral contraceptives and in the control of menstruation and the treatment of abnormal uterine bleeding | - |
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| norgestrel | (noun) synthetic progestin used in oral contraceptives | - |
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| normal | (noun) something regarded as a normative example | Synonyms: convention, formula, pattern, rule |
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| nosewheel | (noun) a wheel located under the nose of an airplane that is part of the plane's landing gear | - |
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| nostril | (noun) either one of the two external openings to the nasal cavity in the nose | Synonyms: anterior naris |
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| novel | (noun) a printed and bound book that is an extended work of fiction | - |
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| (noun) an extended fictional work in prose; usually in the form of a story | - |
| null | (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cipher, cypher, goose egg, nada, naught, nil, nix, nothing, zero, zilch, zip, zippo |
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| numeral | (noun) a symbol used to represent a number | Synonyms: number |
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| (noun) a word expressing a number. | - |
| numskull | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: blockhead, bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, shithead |
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| nutshell | (noun) the shell around the kernel of a nut | - |
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| oatmeal | (noun) porridge made of rolled oats | Synonyms: burgoo |
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| (noun) meal made from rolled or ground oats | Synonyms: rolled oats |
| oddball | (noun) a person with an unusual or odd personality | Synonyms: eccentric, eccentric person, flake, geek |
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| oenomel | (noun) wine mixed with honey | - |
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| oestradiol | (noun) the most powerful female hormone that occurs naturally; synthesized and used to treat estrogen deficiency and breast cancer | Synonyms: estradiol |
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| oestriol | (noun) a naturally occurring estrogenic hormone; a synthetic form is used to treat estrogen deficiency | Synonyms: estriol |
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| offal | (noun) viscera and trimmings of a butchered animal often considered inedible by humans | - |
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| official | (noun) someone who administers the rules of a game or sport | - |
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| (noun) a worker who holds or is invested with an office | Synonyms: functionary |
| oil | (noun) oil paint containing pigment that is used by an artist | Synonyms: oil color, oil colour |
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| (noun) any of a group of liquid edible fats that are obtained from plants | Synonyms: vegetable oil |
| (noun) a slippery or viscous liquid or liquefiable substance not miscible with water | - |
| (noun) a dark oil consisting mainly of hydrocarbons | Synonyms: crude, crude oil, fossil oil, petroleum, rock oil |
| opal | (noun) a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones | - |
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| openbill | (noun) stork with a grooved bill whose upper and lower parts touch only at the base and tip | - |
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| oral | (noun) an examination conducted by spoken communication | Synonyms: oral exam, oral examination, viva, viva voce |
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| orchil | (noun) any of various lecanoras that yield the dye archil | Synonyms: archil |
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| (noun) a purplish dye obtained from orchil lichens | Synonyms: archil, cudbear |
| ordeal | (noun) a primitive method of determining a person's guilt or innocence by subjecting the accused person to dangerous or painful tests believed to be under divine control; escape was usually taken as a sign of innocence | Synonyms: trial by ordeal |
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| (noun) a severe or trying experience | - |
| ordinal | (noun) the number designating place in an ordered sequence | Synonyms: no., ordinal number |
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| oriel | (noun) a projecting bay window corbeled or cantilevered out from a wall | Synonyms: oriel window |
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| original | (noun) an original creation (i.e., an audio recording) from which copies can be made | Synonyms: master, master copy |
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| (noun) something that serves as a model or a basis for making copies | Synonyms: archetype, pilot |
| orinasal | (noun) a speech sound produced with both the oral and nasal passages open (as French nasal vowels) | Synonyms: orinasal phone |
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| ornamental | (noun) any plant grown for its beauty or ornamental value | - |
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| ousel | (noun) common black European thrush | Synonyms: blackbird, European blackbird, merl, merle, ouzel, Turdus merula |
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| outfall | (noun) the outlet of a river or drain or other source of water | - |
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| ouzel | (noun) common black European thrush | Synonyms: blackbird, European blackbird, merl, merle, ousel, Turdus merula |
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| oval | (noun) a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it | Synonyms: ellipse |
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| overall | (noun) (usually plural) work clothing consisting of denim trousers (usually with a bib and shoulder straps) | - |
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| (noun) a loose protective coverall or smock worn over ordinary clothing for dirty work | Synonyms: boilers suit, boilersuit |
| overappraisal | (noun) an appraisal that is too high | Synonyms: overestimate, overestimation, overvaluation |
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| overcall | (noun) (bridge) a bid that is higher than your opponent's bid (especially when your partner has not bid at all and your bid exceeds the value of your hand) | Synonyms: overbid |
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| overhaul | (noun) periodic maintenance on a car or machine | Synonyms: inspection and repair, service |
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| (noun) the act of improving by renewing and restoring | Synonyms: redevelopment, renovation |
| overkill | (noun) any effort that seems to go farther than would be necessary to achieve its goal | - |
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| (noun) the capability to obliterate a target with more weapons (especially nuclear weapons) than are required | - |
| overmantel | (noun) a shelf over a mantelpiece | - |
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| overspill | (noun) the occurrence of surplus liquid (as water) exceeding the limit or capacity | Synonyms: overflow, runoff |
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| (noun) the relocation of people from overcrowded cities; they are accommodated in new houses or apartments in smaller towns | - |
| overzeal | (noun) The quality of being excessively zealous. | Synonyms: overzealousness |
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| owl | (noun) nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes | Synonyms: bird of Minerva, bird of night, hooter |
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| oxtail | (noun) the skinned tail of cattle; used especially for soups | - |
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| paddlewheel | (noun) a large wheel fitted with paddles and driven by an engine in order to propel a boat | Synonyms: paddle wheel |
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| pail | (noun) a roughly cylindrical vessel that is open at the top | Synonyms: bucket |
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| (noun) the quantity contained in a pail | Synonyms: pailful |
| pailful | (noun) the quantity contained in a pail | Synonyms: pail |
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| paintball | (noun) a game that simulates military combat; players on one team try to eliminate players on the opposing team by shooting capsules of paint at them | - |
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| (noun) a capsule filled with water-soluble dye used as a projectile in playing the game of paintball | - |
| pal | (noun) a close friend who accompanies his buddies in their activities | Synonyms: brother, buddy, chum, crony, sidekick |
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| palatal | (noun) a semivowel produced with the tongue near the palate (like the initial sound in the English word `yeast') | - |
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| pall | (noun) hanging cloth used as a blind (especially for a window) | Synonyms: curtain, drape, drapery, mantle |
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| (noun) burial garment in which a corpse is wrapped | Synonyms: cerement, shroud, winding-clothes, winding-sheet |
| (noun) a sudden numbing dread | Synonyms: chill |
| panel | (noun) sheet that forms a distinct (usually flat and rectangular) section or component of something | - |
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| (noun) electrical device consisting of a flat insulated surface that contains switches and dials and meters for controlling other electrical devices | Synonyms: board, control board, control panel, instrument panel |
| (noun) a soft pad placed under a saddle | - |
| (noun) (computer science) a small temporary window in a graphical user interface that appears in order to request information from the user; after the information has been provided the user dismisses the box with `okay' or `cancel' | Synonyms: dialog box |
| (noun) a piece of cloth that is generally triangular or tapering; used in making garments or umbrellas or sails | Synonyms: gore |
| (noun) a group of people gathered for a special purpose as to plan or discuss an issue or judge a contest etc | - |
| (noun) a committee appointed to judge a competition | Synonyms: jury |
| (noun) (law) a group of people summoned for jury service (from whom a jury will be chosen) | Synonyms: venire |
| pansexual | (noun) a person who participates in (or is open to) sexual activities of many kinds | - |
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| paralegal | (noun) a person with specialized training who assists lawyers | Synonyms: legal assistant |
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| parallel | (noun) something having the property of being analogous to something else | Synonyms: analog, analogue |
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| (noun) an imaginary line around the Earth parallel to the equator | Synonyms: latitude, line of latitude, parallel of latitude |
| (noun) (mathematics) one of a set of parallel geometric figures (parallel lines or planes) | - |
| paramedical | (noun) a person trained to assist medical professionals and to give emergency medical treatment | Synonyms: paramedic |
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| paraprofessional | (noun) a trained worker who is not a member of a profession but who assists a professional | - |
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| parasail | (noun) parachute that will lift a person up into the air when it is towed by a motorboat or a car | - |
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| parasol | (noun) a handheld collapsible source of shade | Synonyms: sunshade |
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| parcel | (noun) the allotment of some amount by dividing something | Synonyms: portion, share |
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| (noun) a wrapped container | Synonyms: package |
| (noun) a collection of things wrapped or boxed together | Synonyms: bundle, package, packet |
| (noun) an extended area of land | Synonyms: parcel of land, piece of ground, piece of land, tract |
| parenthetical | (noun) an expression in parentheses | Synonyms: parenthetical expression |
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| parimutuel | (noun) betting where winners share the total amount wagered | - |
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| partial | (noun) the derivative of a function of two or more variables with respect to a single variable while the other variables are considered to be constant | Synonyms: partial derivative |
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| (noun) a harmonic with a frequency that is a multiple of the fundamental frequency | Synonyms: overtone, partial tone |
| participial | (noun) a non-finite form of the verb; in English it is used adjectivally and to form compound tenses | Synonyms: participle |
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| pascal | (noun) a unit of pressure equal to one newton per square meter | Synonyms: Pa |
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| passel | (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, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad |
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| pastel | (noun) any of various pale or light colors | - |
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| pastil | (noun) a medicated lozenge used to soothe the throat | Synonyms: cough drop, pastille, troche |
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| pastoral | (noun) a musical composition that evokes rural life | Synonyms: idyl, idyll, pastorale |
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| (noun) a literary work idealizing the rural life (especially the life of shepherds) | - |
| (noun) a letter from a pastor to the congregation | - |
| patrial | (noun) a person who has the right to be considered legally a British citizen (by virtue of the birth of a parent or grandparent) | - |
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| patrol | (noun) the activity of going around or through an area at regular intervals for security purposes | - |
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| (noun) a detachment used for security or reconnaissance | - |
| (noun) a group that goes through a region at regular intervals for the purpose of security | - |
| pawl | (noun) a hinged catch that fits into a notch of a ratchet to move a wheel forward or prevent it from moving backward | Synonyms: click, detent, dog |
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| payroll | (noun) the department that determines the amounts of wage or salary due to each employee | Synonyms: payroll department |
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| (noun) a list of employees and their salaries | Synonyms: paysheet |
| (noun) the total amount of money paid in wages | Synonyms: paysheet |
| paywall | (noun) A mechanism used to limit access to only paying users | - |
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| pdl | (noun) a unit of force equal to the force that imparts an acceleration of 1 foot/sec/sec to a mass of 1 pound; equal to 0.1382 newtons | Synonyms: poundal |
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| peafowl | (noun) very large terrestrial southeast Asian pheasant often raised as an ornamental bird | Synonyms: bird of Juno |
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| peal | (noun) a deep prolonged sound (as of thunder or large bells) | Synonyms: pealing, roll, rolling |
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| pearl | (noun) a shade of white the color of bleached bones | Synonyms: bone, ivory, off-white |
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| (noun) a smooth lustrous round structure inside the shell of a clam or oyster; much valued as a jewel | - |
| (noun) a shape that is spherical and small | Synonyms: bead, drop |
| pectoral | (noun) an adornment worn on the chest or breast | Synonyms: pectoral medallion |
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| (noun) either of two large muscles of the chest | Synonyms: musculus pectoralis, pecs, pectoral muscle, pectoralis |
| pedal | (noun) a lever that is operated with the foot | Synonyms: foot lever, foot pedal, treadle |
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| (noun) a sustained bass note | Synonyms: pedal point |
| pedestal | (noun) a support or foundation | Synonyms: base, stand |
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| (noun) an architectural support or base (as for a column or statue) | Synonyms: footstall, plinth |
| (noun) a position of great esteem (and supposed superiority) | - |
| pedicel | (noun) a small stalk bearing a single flower of an inflorescence; an ultimate division of a common peduncle | Synonyms: pedicle |
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| peel | (noun) the rind of a fruit or vegetable | Synonyms: skin |
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| peepul | (noun) fig tree of India noted for great size and longevity; lacks the prop roots of the banyan; regarded as sacred by Buddhists | Synonyms: bo tree, Ficus religiosa, pipal, pipal tree, pipul, sacred fig |
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| pel | (noun) (computer science) the smallest discrete component of an image or picture on a CRT screen (usually a colored dot) | Synonyms: picture element, pixel |
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| pencil | (noun) a thin cylindrical pointed writing implement; a rod of marking substance encased in wood | - |
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| (noun) a cosmetic in a long thin stick; designed to be applied to a particular part of the face | - |
| (noun) a figure formed by a set of straight lines or light rays meeting at a point | - |
| (noun) graphite (or a similar substance) used in such a way as to be a medium of communication | - |
| pennoncel | (noun) a small pennant borne on a lance | Synonyms: pennoncelle, penoncel |
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| pennyroyal | (noun) Eurasian perennial mint have small lilac-blue flowers and ovate leaves; yields an aromatic oil | Synonyms: Mentha pulegium |
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| (noun) erect hairy branching American herb having purple-blue flowers; yields an essential oil used as an insect repellent and sometimes in folk medicine | Synonyms: American pennyroyal, Hedeoma pulegioides |
| penoncel | (noun) a small pennant borne on a lance | Synonyms: pennoncel, pennoncelle |
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| pentaerythritol | (noun) a coronary vasodilator (trade name Peritrate) used to treat angina pectoris | Synonyms: Peritrate |
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| pentail | (noun) brown tree shrew having a naked tail bilaterally fringed with long stiff hairs on the distal third; of Malaysia | Synonyms: pen-tail, pen-tailed tree shrew |
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| pentamethylenetetrazol | (noun) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark | Synonyms: Metrazol, pentylenetetrazol |
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| pentobarbital | (noun) a barbiturate (trade name Nembutal) used as a sedative and hypnotic and antispasmodic | Synonyms: Nembutal, pentobarbital sodium, yellow jacket |
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| pentylenetetrazol | (noun) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark | Synonyms: Metrazol, pentamethylenetetrazol |
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| perennial | (noun) (botany) a plant lasting for three seasons or more | - |
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| peril | (noun) a venture undertaken without regard to possible loss or injury | Synonyms: danger, risk |
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| (noun) a source of danger; a possibility of incurring loss or misfortune | Synonyms: endangerment, hazard, jeopardy, risk |
| (noun) a state of danger involving risk | Synonyms: riskiness |