| 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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| oleoresin | (noun) a naturally occurring mixture of a resin and an essential oil; obtained from certain plants | - |
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| omnivore | (noun) an animal that feeds on both animal and vegetable substances | - |
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| (noun) a person who eats all kinds of foods | - |
| oophorectomy | (noun) surgical removal of one or both ovaries | Synonyms: ovariectomy |
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| oospore | (noun) a thick-walled sexual spore that develops from a fertilized oosphere in some algae and fungi | - |
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| ore | (noun) a monetary subunit in Denmark and Norway and Sweden; 100 ore equal 1 krona | - |
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| (noun) a mineral that contains metal that is valuable enough to be mined | - |
| oregano | (noun) pungent leaves used as seasoning with meats and fowl and in stews and soups and omelets | Synonyms: marjoram |
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| (noun) aromatic Eurasian perennial | Synonyms: marjoram, Origanum vulgare, pot marjoram, wild marjoram, winter sweet |
| oreide | (noun) alloy of copper and tin and zinc; used in imitation gold jewelry | Synonyms: oroide |
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| oreo | (noun) chocolate cookie with white cream filling | Synonyms: oreo cookie |
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| orthochorea | (noun) a form of chorea in which spasms occur mainly when the patient is erect | - |
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| osmoreceptor | (noun) sensory end organ that responds to changes in osmotic pressure | - |
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| oxidoreductase | (noun) an enzyme that catalyzes oxidation-reduction | - |
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| oxidoreduction | (noun) a reversible chemical reaction in which one reaction is an oxidation and the reverse is a reduction | Synonyms: oxidation-reduction, redox |
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| phosphorescence | (noun) a fluorescence that persists after the bombarding radiation has ceased | - |
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| photoretinitis | (noun) damage to the retina resulting from exposure of the eye to the sun without adequate protection | - |
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| pinafore | (noun) a sleeveless dress resembling an apron; worn over other clothing | Synonyms: jumper, pinny |
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| pneumatophore | (noun) an air-filled root (submerged or exposed) that can function as a respiratory organ of a marsh or swamp plant | - |
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| polyplacophore | (noun) primitive elongated bilaterally symmetrical marine mollusk having a mantle covered with eight calcareous plates | Synonyms: chiton, coat-of-mail shell, sea cradle |
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| polypore | (noun) woody pore fungi; any fungus of the family Polyporaceae or family Boletaceae having the spore-bearing surface within tubes or pores; the fruiting bodies are usually woody at maturity and persistent | Synonyms: pore fungus, pore mushroom |
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| pore | (noun) any small opening in the skin or outer surface of an animal | - |
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| (noun) a minute epidermal pore in a leaf or stem through which gases and water vapor can pass | Synonyms: stoma, stomate |
| (noun) any tiny hole admitting passage of a liquid (fluid or gas) | - |
| prioress | (noun) the superior of a group of nuns | Synonyms: abbess, mother superior |
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| rainforest | (noun) a forest with heavy annual rainfall | Synonyms: rain forest |
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| reforestation | (noun) the restoration (replanting) of a forest that had been reduced by fire or cutting | Synonyms: re-afforestation |
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| restorer | (noun) a skilled worker who is employed to restore or refinish buildings or antique furniture | Synonyms: preserver, refinisher, renovator |
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| sagamore | (noun) a chief of a North American tribe or confederation (especially an Algonquian chief) | Synonyms: sachem |
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| score | (noun) the act of scoring in a game or sport | - |
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| (noun) a seduction culminating in sexual intercourse | Synonyms: sexual conquest |
| (noun) a number or letter indicating quality (especially of a student's performance) | Synonyms: grade, mark |
| (noun) the facts about an actual situation | - |
| (noun) a written form of a musical composition; parts for different instruments appear on separate staves on large pages | Synonyms: musical score |
| (noun) a resentment strong enough to justify retaliation | Synonyms: grievance, grudge |
| (noun) a set of twenty members | - |
| (noun) grounds | Synonyms: account |
| (noun) a number that expresses the accomplishment of a team or an individual in a game or contest | - |
| (noun) a slight surface cut (especially a notch that is made to keep a tally) | Synonyms: scotch |
| (noun) an amount due (as at a restaurant or bar) | - |
| scoreboard | (noun) a large board for displaying the score of a contest (and some other information) | - |
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| scorecard | (noun) (golf) a record of scores (as in golf) | Synonyms: card |
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| scorekeeper | (noun) an official who records the score during the progress of a game | Synonyms: scorer |
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| scorer | (noun) a player who makes a score in a game or contest | - |
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| (noun) a logger who marks trees to be felled | - |
| (noun) an official who records the score during the progress of a game | Synonyms: scorekeeper |
| scores | (noun) a large number or amount | Synonyms: dozens, gobs, heaps, lashings, loads, lots, oodles, piles, rafts, scads, slews, stacks, tons, wads |
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| seashore | (noun) the shore of a sea or ocean | Synonyms: coast, sea-coast, seacoast |
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| semaphore | (noun) an apparatus for visual signaling with lights or mechanically moving arms | - |
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| shore | (noun) a beam or timber that is propped against a structure to provide support | Synonyms: shoring |
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| (noun) the land along the edge of a body of water | - |
| shorebird | (noun) any of numerous wading birds that frequent mostly seashores and estuaries | Synonyms: limicoline bird, shore bird |
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| shoreline | (noun) a boundary line between land and water | - |
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| signore | (noun) an Italian title of respect for a man; equivalent to the English `sir'; used separately (not prefixed to his name) | - |
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| siphonophore | (noun) a floating or swimming oceanic colony of polyps often transparent or showily colored | - |
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| smoothbore | (noun) a firearm that has no rifling | - |
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| snore | (noun) the act of snoring or producing a snoring sound | Synonyms: snoring, stertor |
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| (noun) the rattling noise produced when snoring | - |
| snorer | (noun) someone who snores while sleeping | - |
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| sophomore | (noun) a second-year undergraduate | Synonyms: soph |
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| sore | (noun) an open skin infection | - |
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| sorehead | (noun) someone who is peevish or disgruntled | - |
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| soreness | (noun) an uncomfortable feeling of mental painfulness or distress | Synonyms: discomfort, irritation |
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| (noun) a pain that is felt (as when the area is touched) | Synonyms: rawness, tenderness |
| sporangiophore | (noun) stalk bearing one or more sporangia | - |
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| spore | (noun) a small usually single-celled asexual reproductive body produced by many nonflowering plants and fungi and some bacteria and protozoans and that are capable of developing into a new individual without sexual fusion | - |
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| sporophore | (noun) a spore-bearing branch or organ: the part of the thallus of a sporophyte that develops spores; in ferns and mosses and liverworts is practically equivalent to the sporophyte | - |
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| stevedore | (noun) a laborer who loads and unloads vessels in a port | Synonyms: dock-walloper, dock worker, docker, dockhand, dockworker, loader, longshoreman, lumper |
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| store | (noun) a mercantile establishment for the retail sale of goods or services | Synonyms: shop |
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| (noun) a depository for goods | Synonyms: depot, entrepot, storage, storehouse |
| (noun) an electronic memory device | Synonyms: computer memory, computer storage, memory, memory board, storage |
| (noun) a supply of something available for future use | Synonyms: fund, stock |
| storefront | (noun) the front side of a store facing the street; usually contains display windows | Synonyms: shopfront |
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| storehouse | (noun) a depository for goods | Synonyms: depot, entrepot, storage, store |
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| storekeeper | (noun) a merchant who owns or manages a shop | Synonyms: market keeper, shopkeeper, tradesman |
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| storeroom | (noun) a room in which things are stored | Synonyms: storage room, stowage |
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| storey | (noun) a structure consisting of a room or set of rooms at a single position along a vertical scale | Synonyms: floor, level, story |
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| succorer | (noun) someone who gives help in times of need or distress or difficulty | Synonyms: succourer |
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| sycamore | (noun) any of several trees of the genus Platanus having thin pale bark that scales off in small plates and lobed leaves and ball-shaped heads of fruits | Synonyms: plane tree, platan |
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| (noun) variably colored and sometimes variegated hard tough elastic wood of a sycamore tree | Synonyms: lacewood |
| (noun) Eurasian maple tree with pale grey bark that peels in flakes like that of a sycamore tree; leaves with five ovate lobes yellow in autumn | Synonyms: Acer pseudoplatanus, great maple, scottish maple |
| (noun) thick-branched wide-spreading tree of Africa and adjacent southwestern Asia often buttressed with branches rising from near the ground; produces cluster of edible but inferior figs on short leafless twigs; the biblical sycamore | Synonyms: Ficus sycomorus, mulberry fig, sycamore fig |
| syncategorem | (noun) a syncategorematic expression; a word that cannot be used alone as a term in a logical proposition | Synonyms: syncategoreme |
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| syncategoreme | (noun) a syncategorematic expression; a word that cannot be used alone as a term in a logical proposition | Synonyms: syncategorem |
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| taboret | (noun) a low stool in the shape of a drum | Synonyms: tabouret |
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| teliospore | (noun) a chlamydospore that develops in the last stage of the life cycle of the rust fungus | - |
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| terpsichore | (noun) taking a series of rhythmical steps (and movements) in time to music | Synonyms: dance, dancing, saltation |
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| terpsichorean | (noun) a performer who dances professionally | Synonyms: dancer, professional dancer |
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| tetrachlorethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachloroethylene |
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| tetraspore | (noun) one of the four asexual spores produced within a sporangium | - |
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| theorem | (noun) an idea accepted as a demonstrable truth | - |
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| (noun) a proposition deducible from basic postulates | - |
| theoretician | (noun) someone who theorizes (especially in science or art) | Synonyms: idealogue, theoriser, theorist, theorizer |
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| thermoreceptor | (noun) a sensory receptor that responds to heat and cold | - |
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| thermoregulator | (noun) a regulator for automatically regulating temperature by starting or stopping the supply of heat | Synonyms: thermostat |
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| threescore | (noun) a set with 3 times 20 members | - |
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| tore | (noun) commonly the lowest molding at the base of a column | Synonyms: torus |
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| toreador | (noun) someone who fights bulls | Synonyms: bullfighter |
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| torero | (noun) a matador or one of the supporting team during a bull fight | - |
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| tussore | (noun) oriental moth that produces brownish silk | Synonyms: Antheraea mylitta, tussah, tusseh, tusser, tussur |
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| underscore | (noun) a line drawn underneath (especially under written matter) | Synonyms: underline |
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| wherefore | (noun) the cause or intention underlying an action or situation, especially in the phrase `the whys and wherefores' | Synonyms: why |
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| whore | (noun) a woman who engages in sexual intercourse for money | Synonyms: bawd, cocotte, cyprian, fancy woman, harlot, lady of pleasure, prostitute, sporting lady, tart, woman of the street, working girl |
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| whoredom | (noun) offering sexual intercourse for pay | Synonyms: harlotry, prostitution |
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| whorehouse | (noun) a building where prostitutes are available | Synonyms: bagnio, bawdyhouse, bordello, brothel, cathouse, house of ill repute, house of prostitution, sporting house |
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| whoremaster | (noun) a pimp who procures whores | Synonyms: whoremonger |
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| (noun) a prostitute's customer | Synonyms: john, trick, whoremonger |
| whoremonger | (noun) a pimp who procures whores | Synonyms: whoremaster |
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| (noun) a prostitute's customer | Synonyms: john, trick, whoremaster |
| whoreson | (noun) the illegitimate offspring of unmarried parents | Synonyms: bastard, by-blow, illegitimate, illegitimate child, love child |
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| (noun) insulting terms of address for people who are stupid or irritating or ridiculous | Synonyms: asshole, bastard, cocksucker, dickhead, mother fucker, motherfucker, prick, shit, SOB, son of a bitch |
| woodborer | (noun) any of various insects or larvae or mollusks that bore into wood | Synonyms: borer |
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| yore | (noun) time long past | - |
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| zoospore | (noun) an asexual spore of some algae and fungi that moves by means of flagella | - |
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| zygospore | (noun) a plant spore formed by two similar sexual cells | - |
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