/ Thesaurus / R Synonyms of rhynchocephalia Find synonyms for: Noun1. Rhynchocephalia, order Rhynchocephalia, animal orderusage: tuataras; extinct forms from middle TriassicWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: penurious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language