/ Thesaurus / G Synonyms of genus arca Find synonyms for: Noun1. Arca, genus Arca, mollusk genususage: type genus of the family Arcidae: ark shells and blood clamsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: chicory Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language