splash has 16 distinct synonyms spread across 9 of its 13 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.
mark or overlay with patches of contrasting color or texture; cause to appear splashed or spattered
“The mountain was splashed with snow”
strike and dash about in a liquid
“The boys splashed around in the pool”
a prominent or sensational but short-lived news event
“he made a great splash and then disappeared”
Synonyms, antonyms and the broader and narrower relations for splash come from Princeton University’s WordNet. Full sources and licences.
a small quantity of something moist or liquid
“a dab of paint”
a patch of bright color
“her red hat gave her outfit a splash of color”
the act of splashing a (liquid) substance on a surface