/ Thesaurus / L Synonyms of lower respiratory infection Find synonyms for: Noun1. lower respiratory infection, respiratory tract infection, respiratory infectionusage: infection of the lower respiratory tractWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: aversion Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language