Breadcrumb Home > Thesaurus > U Synonyms of underworld Find synonyms for: Noun 1. underworld, class, stratum, social class, socio-economic class usage: the criminal class 2. Hell, Hades, infernal region, netherworld, Scheol, underworld, imaginary place, mythical place, fictitious place usage: (religion) the world of the dead; "No one goes to Hades with all his immense wealth"-Theognis WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of underworld (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: anomie Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language