/ Thesaurus / Z Synonyms of zillions Find synonyms for: Noun1. million, billion, trillion, zillion, jillion, gazillion, large indefinite quantity, large indefinite amountusage: a very large indefinite number (usually hyperbole); "there were millions of flies"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language