/ Thesaurus / P Synonyms of phenergan Find synonyms for: Noun1. promethazine, Phenergan, antihistamine, antiemetic, antiemetic drugusage: antihistamine (trade name Phenergan) used to treat allergies; also an antiemetic used to treat motion sicknessWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language