/ Thesaurus / S Synonyms of sumach Find synonyms for: Noun1. sumac, sumach, shumac, shrub, bushusage: a shrub or tree of the genus Rhus (usually limited to the non-poisonous members of the genus)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language