/ Thesaurus / L Synonyms of little brother Find synonyms for: Noun1. little brother, brother, blood brotherusage: a younger brother; "my little brother just had his 50th birthday"WordNet 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