cook has 13 distinct synonyms spread across 3 of its 7 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
prepare a hot meal
“My husband doesn't cook”
tamper, with the purpose of deception
“Fudge the figures”
transform by heating
“The apothecary cooked the medicinal mixture in a big iron kettle”
English navigator who claimed the east coast of Australia for Britain and discovered several Pacific islands (1728-1779)
Synonyms, antonyms and the broader and narrower relations for cook come from Princeton University’s WordNet. Full sources and licences.