Breadcrumb Home > Thesaurus > N Synonyms of niobium Find synonyms for: Noun 1. niobium, Nb, atomic number 41, metallic element, metal usage: a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of niobium (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: neologism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language