WordNet records no synonym and no antonym for pothunter. 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 participates in contests in order to collect trophies
someone who hunts for food (not for sport)
Synonyms, antonyms and the broader and narrower relations for pothunter come from Princeton University’s WordNet. Full sources and licences.