/ Thesaurus / N Synonyms of niobite Find synonyms for: Noun1. niobite, columbite, mineralusage: a black mineral that is an ore of niobium and tantalumWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language