/ Thesaurus / L Synonyms of lower carboniferous Find synonyms for: Noun1. Mississippian, Missippian period, Lower Carboniferous, Lower Carboniferous periodusage: from 345 million to 310 million years ago; increase of land areas; primitive ammonites; winged insectsWordNet 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