/ Thesaurus / A Synonyms of atomic number 41 Find synonyms for: Noun1. niobium, Nb, atomic number 41, metallic element, metalusage: a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbiumWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language