/ Thesaurus / H Synonyms of half brother Find synonyms for: Noun1. stepbrother, half-brother, half brother, brother, blood brotherusage: a brother who has only one parent in common with youWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language