set aside has 5 distinct synonyms spread across 2 of its 3 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.
give or assign a resource to a particular person or cause
“I will earmark this money for your research”
make inoperative or stop
“suspend payments on the loan”
Synonyms, antonyms and the broader and narrower relations for set aside come from Princeton University’s WordNet. Full sources and licences.
annul (a legal decision)
“the court set aside the conviction”