/ Thesaurus / R Synonyms of rhus glabra Find synonyms for: Noun1. smooth sumac, scarlet sumac, vinegar tree, Rhus glabra, sumac, sumach, shumacusage: common nonpoisonous shrub of eastern North America with waxy compound leaves and green paniculate flowers followed by red berriesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language