/ Thesaurus / T Synonyms of third class Find synonyms for: Noun1. third-class mail, third class, mailusage: mail consisting of printed matter qualifying for reduced postal rates2. tourist class, third class, accommodationusage: inexpensive accommodations on a ship or trainWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: aversion Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language