/ Thesaurus / S Synonyms of swiftness Find synonyms for: Noun1. speed, swiftness, fastness, pace, rateusage: a rate (usually rapid) at which something happens; "the project advanced with gratifying speed"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: illegible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language