/ Thesaurus / R Synonyms of river acheron Find synonyms for: Noun1. Acheron, River Acheronusage: (Greek mythology) a river in Hades across which the souls of the dead were carried by CharonWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language