sweat has 12 distinct synonyms spread across 4 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.
salty fluid secreted by sweat glands
“sweat poured off his brow”
condensation of moisture on a cold surface
“the cold glasses were streaked with sweat”
use of physical or mental energy; hard work
“he got an A for effort”
Synonyms, antonyms and the broader and narrower relations for sweat come from Princeton University’s WordNet. Full sources and licences.