/ Thesaurus / S Synonyms of speaking tube Find synonyms for: Noun1. speaking tube, tube, tubingusage: a tube for conveying the sound of a voice from one room to anotherWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language