work out has 14 distinct synonyms spread across 6 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.
happen in a certain way, leading to, producing, or resulting in a certain outcome, often well
“Things worked out in an interesting way”
be calculated
“The fees work out to less than $1,000”
find the solution to (a problem or question) or understand the meaning of
“did you solve the problem?”
Synonyms, antonyms and the broader and narrower relations for work out come from Princeton University’s WordNet. Full sources and licences.