/ Thesaurus / S Synonyms of superclass gnathostomata Find synonyms for: Noun1. Gnathostomata, superclass Gnathostomata, classusage: comprising all vertebrates with upper and lower jawsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language