/ Thesaurus / B Synonyms of blue whale Find synonyms for: Noun1. blue whale, sulfur bottom, Balaenoptera musculus, baleen whale, whalebone whaleusage: largest mammal ever known; bluish-grey migratory whalebone whale mostly of southern hemisphereWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language