/ Thesaurus / L Synonyms of lieutenant jg Find synonyms for: Noun1. lieutenant junior grade, lieutenant JG, commissioned naval officerusage: an officer holding a commissioned rank in the United States Navy or United States Coast Guard; below lieutenant and above ensignWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language