WordNet records no synonym and no antonym for snorter. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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.
someone who expresses contempt or indignation by uttering a snorting sound
something outstandingly difficult
“the problem was a real snorter”
something that is extraordinary or remarkable or prominent
Synonyms, antonyms and the broader and narrower relations for snorter come from Princeton University’s WordNet. Full sources and licences.
“a snorter of a sermon”