cost has 4 distinct synonyms spread across 3 of its 5 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.
the total spent for goods or services including money and time and labor
Synonyms, antonyms and the broader and narrower relations for cost come from Princeton University’s WordNet. Full sources and licences.
the property of having material worth (often indicated by the amount of money something would bring if sold)
“the fluctuating monetary value of gold and silver”
value measured by what must be given or done or undergone to obtain something
“the cost in human life was enormous”
require to lose, suffer, or sacrifice
“This mistake cost him his job”