spat has 10 distinct synonyms spread across 4 of its 10 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.
come down like raindrops
“Bullets were spatting down on us”
become permanently attached
“mollusks or oysters spat”
strike with a sound like that of falling rain
“Bullets were spatting the leaves”
clap one's hands or shout after performances to indicate approval
clap one's hands together
“The children were clapping to the music”
Synonyms, antonyms and the broader and narrower relations for spat come from Princeton University’s WordNet. Full sources and licences.