| cob | (noun) adult male swan | - |
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| (noun) stocky short-legged harness horse | - |
| (noun) white gull having a black back and wings | Synonyms: black-backed gull, great black-backed gull, Larus marinus |
| (noun) nut of any of several trees of the genus Corylus | Synonyms: cobnut, filbert, hazelnut |
| cobalamin | (noun) a B vitamin that is used to treat pernicious anemia | Synonyms: antipernicious anemia factor, cyanocobalamin, vitamin B12 |
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| cobalt | (noun) a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition | Synonyms: atomic number 27, Co |
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| cobaltite | (noun) a rare silvery-white mineral; important ore of cobalt | - |
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| cobber | (noun) Australian term for a pal | - |
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| cobble | (noun) rectangular paving stone with curved top; once used to make roads | Synonyms: cobblestone, sett |
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| cobbler | (noun) a pie made of fruit with rich biscuit dough usually only on top of the fruit | Synonyms: deep-dish pie |
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| (noun) tall sweetened iced drink of wine or liquor with fruit | - |
| (noun) a person who makes or repairs shoes | Synonyms: shoemaker |
| cobblers | (noun) a man's testicles | - |
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| (noun) nonsense | - |
| cobblestone | (noun) rectangular paving stone with curved top; once used to make roads | Synonyms: cobble, sett |
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| cobbling | (noun) the shoemaker's trade | Synonyms: shoe repairing, shoemaking |
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| cobia | (noun) large dark-striped tropical food and game fish related to remoras; found worldwide in coastal to open waters | Synonyms: Rachycentron canadum, sergeant fish |
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| cobnut | (noun) nut of any of several trees of the genus Corylus | Synonyms: cob, filbert, hazelnut |
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| (noun) small nut-bearing tree much grown in Europe | Synonyms: Corylus avellana, Corylus avellana grandis, filbert |
| cobra | (noun) venomous Asiatic and African elapid snakes that can expand the skin of the neck into a hood | - |
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| cobweb | (noun) a dense elaborate spider web that is more efficient than the orb web | - |
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| (noun) filaments from a web that was spun by a spider | Synonyms: gossamer |
| (noun) a fabric so delicate and transparent as to resemble a web of a spider | - |