WordNet records no synonym and no antonym for wisdom tooth. It is the only member of its synset, 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.
any of the last 4 teeth on each side of the upper and lower jaw; the last of the permanent teeth to erupt (between ages 16 and 21)
Synonyms, antonyms and the broader and narrower relations for wisdom tooth come from Princeton University’s WordNet. Full sources and licences.