WordNet records no synonym and no antonym for tooth. 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.
hard bonelike structures in the jaws of vertebrates; used for biting and chewing or for attack and defense
Synonyms, antonyms and the broader and narrower relations for tooth come from Princeton University’s WordNet. Full sources and licences.
something resembling the tooth of an animal
a means of enforcement
“the treaty had no teeth in it”
one of a number of uniform projections on a gear