| acorea | (noun) absence of the pupil in an eye | - |
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| albacore | (noun) large pelagic tuna the source of most canned tuna; reaches 93 pounds and has long pectoral fins; found worldwide in tropical and temperate waters | Synonyms: long-fin tunny, Thunnus alalunga |
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| (noun) relatively small tuna with choice white flesh; major source of canned tuna | - |
| core | (noun) a bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil | - |
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| (noun) the chamber of a nuclear reactor containing the fissile material where the reaction takes place | - |
| (noun) (computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data; now superseded by semiconductor memories | Synonyms: magnetic core |
| (noun) the choicest or most essential or most vital part of some idea or experience | Synonyms: center, centre, essence, gist, heart, heart and soul, inwardness, kernel, marrow, meat, nitty-gritty, nub, pith, substance, sum |
| (noun) the central meaning or theme of a speech or literary work | Synonyms: burden, effect, essence, gist |
| (noun) a small group of indispensable persons or things | Synonyms: core group, nucleus |
| (noun) the center of an object | - |
| (noun) the central part of the Earth | - |
| (noun) a cylindrical sample of soil or rock obtained with a hollow drill | - |
| coreference | (noun) the grammatical relation between two words that have a common referent | - |
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| coreid | (noun) a true bug | Synonyms: coreid bug |
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| coreligionist | (noun) someone having the same religion as another person | - |
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| coreopsis | (noun) any of numerous plants of the genus Coreopsis having a profusion of showy usually yellow daisylike flowers over long periods; North and South America | Synonyms: tick-weed, tickseed, tickweed |
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| corer | (noun) a device for removing the core from apples | - |
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| corespondent | (noun) the codefendant charged with adultery with the estranged spouse in a divorce proceeding | Synonyms: co-respondent |
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| encore | (noun) an extra or repeated performance; usually given in response to audience demand | - |
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| fourscore | (noun) the cardinal number that is the product of ten and eight | Synonyms: 80, eighty, LXXX |
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| manticore | (noun) a mythical monster having the head of man (with horns) and the body of a lion and the tail of a scorpion | Synonyms: mantichora, manticora, mantiger |
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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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| succorer | (noun) someone who gives help in times of need or distress or difficulty | Synonyms: succourer |
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| threescore | (noun) a set with 3 times 20 members | - |
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| underscore | (noun) a line drawn underneath (especially under written matter) | Synonyms: underline |
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