/ Thesaurus / P Synonyms of pentobarbital sodium Find synonyms for: Noun1. pentobarbital sodium, pentobarbital, Nembutal, yellow jacket, barbiturateusage: a barbiturate (trade name Nembutal) used as a sedative and hypnotic and antispasmodicWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language