/ Thesaurus / B Synonyms of barrier island Find synonyms for: Noun1. barrier island, islandusage: a long narrow sandy island (wider than a reef) running parallel to the shoreWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: entomology Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language