/ Thesaurus / A Synonyms of allergic reaction Find synonyms for: Noun1. allergy, allergic reaction, hypersensitivity reactionusage: hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensityWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: lyre Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language