cock has 16 distinct synonyms spread across 5 of its 8 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.
tilt or slant to one side
“cock one's head”
set the trigger of a firearm back for firing
to walk with a lofty proud gait, often in an attempt to impress others
“He struts around like a rooster in a hen house”
Synonyms, antonyms and the broader and narrower relations for cock come from Princeton University’s WordNet. Full sources and licences.