turn over has 22 distinct synonyms spread across 8 of its 9 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.
do business worth a certain amount of money
“The company turns over ten million dollars a year”
think about carefully; weigh
“They considered the possibility of a strike”
Synonyms, antonyms and the broader and narrower relations for turn over come from Princeton University’s WordNet. Full sources and licences.