/ Thesaurus / L Synonyms of lassa virus Find synonyms for: Noun1. Lassa virus, arenavirususage: the RNA virus that causes Lassa feverWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language