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There are 9 five-letter words beginning with COS

COSEC• cosec sym. Alternative form of csc (“cosecant”).
• COSEC n. a trigonometrical function of an angle, also COSECANT.
COSED• cosed v. Simple past tense and past participle of cose.
• COSE v. to make oneself cosy.
COSES• coses v. Third-person singular simple present indicative form of cose.
• coses n. Plural of cos.
• COSE v. to make oneself cosy.
COSET• coset n. (Algebra, group theory) The set that results from applying a group’s binary operation with a given fixed…
• COSET n. a mathematical subset.
COSEY• cosey adj. Archaic spelling of cosy.
• cosey n. Archaic spelling of cosy.
• Cosey prop.n. A surname.
COSIE• cosie adj. (Scotland) Cosy.
• COSIE n. a covering for a teapot, also COSEY, COZEY, COZIE.
COSTA• costa n. (Anatomy) Synonym of rib.
• costa n. (Botany, zootomy) A riblike part of a plant or animal, such as a midrib of a leaf or a thickened vein…
• Costa prop.n. A surname from the Romance languages.
COSTE• Coste prop.n. A surname.
• COSTE n. (Spenser) a coast.
COSTS• costs n. Plural of cost.
• costs v. Third-person singular simple present indicative form of cost.
• Costs prop.n. Plural of Cost.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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