/ Thesaurus / C Synonyms of carboniferous period Find synonyms for: Noun1. Carboniferous, Carboniferous periodusage: from 345 million to 280 million years agoWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: candid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language