| couple | (noun) a pair who associate with one another | Synonyms: duet, duo, twosome |
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| (noun) a pair of people who live together | Synonyms: match, mates |
| (noun) (physics) something joined by two equal and opposite forces that act along parallel lines | - |
| (noun) two items of the same kind | Synonyms: brace, couplet, distich, duad, duet, duo, dyad, pair, span, twain, twosome, yoke |
| (noun) a small indefinite number | - |
| coupler | (noun) a mechanical device that serves to connect the ends of adjacent objects | Synonyms: coupling |
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| couplet | (noun) a stanza consisting of two successive lines of verse; usually rhymed | - |
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| (noun) two items of the same kind | Synonyms: brace, couple, distich, duad, duet, duo, dyad, pair, span, twain, twosome, yoke |
| duplex | (noun) an apartment having rooms on two floors that are connected by a staircase | Synonyms: duplex apartment |
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| (noun) a house with two units sharing a common wall | Synonyms: duplex house, semidetached house |
| quadruple | (noun) a quantity that is four times as great as another | - |
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| (noun) a set of four similar things considered as a unit | Synonyms: quadruplet, quartet, quartette |
| quadruplet | (noun) a set of four similar things considered as a unit | Synonyms: quadruple, quartet, quartette |
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| (noun) one of four children born at the same time from the same pregnancy | Synonyms: quad |
| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quartet, quatern, quaternary, quaternion, quaternity, tetrad |
| quintuple | (noun) a set of five similar things considered as a unit | Synonyms: quintet, quintette, quintuplet |
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| quintuplet | (noun) a set of five similar things considered as a unit | Synonyms: quintet, quintette, quintuple |
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| (noun) one of five children born at the same time from the same pregnancy | Synonyms: quin, quint |
| (noun) the cardinal number that is the sum of four and one | Synonyms: 5, cinque, fin, five, fivesome, Little Phoebe, pentad, Phoebe, quint, quintet, V |
| scruple | (noun) an ethical or moral principle that inhibits action | - |
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| (noun) uneasiness about the fitness of an action (particularly for reasons of ethics, morals or propriety) | Synonyms: misgiving, qualm |
| (noun) a unit of apothecary weight equal to 20 grains | - |
| scruples | (noun) motivation deriving logically from ethical or moral principles that govern a person's thoughts and actions | Synonyms: conscience, moral sense, sense of right and wrong |
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| sextuplet | (noun) the cardinal number that is the sum of five and one | Synonyms: 6, Captain Hicks, half a dozen, hexad, sestet, sextet, sise, six, sixer, VI |
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| thermocouple | (noun) a kind of thermometer consisting of two wires of different metals that are joined at both ends; one junction is at the temperature to be measured and the other is held at a fixed lower temperature; the current generated in the circuit is proportional to the temperature difference | Synonyms: thermocouple junction |
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