/ Thesaurus / S Synonyms of sounding rocket Find synonyms for: Noun1. sounding rocket, test rocket, research rocket, test instrument vehicleusage: a research rocket used to obtain information about the atmosphere at various altitudesWordNet 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