snort has 12 distinct synonyms spread across 4 of its 6 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.
indicate contempt by breathing noisily and forcefully through the nose
“she snorted her disapproval of the proposed bridegroom”
make a snorting sound by exhaling hard
“The critic snorted contemptuously”
a cry or noise made to express displeasure or contempt
Synonyms, antonyms and the broader and narrower relations for snort come from Princeton University’s WordNet. Full sources and licences.