columbium vs atomic number 41

columbium and atomic number 41 both are nouns.

Word	Noun	Adjective	Verb	Adverb
columbium	Yes	No	No	No
atomic number 41	Yes	No	No	No

As nouns, atomic number 41 is a hypernym of columbium; that is, atomic number 41 is a word with a broader meaning than columbium:

columbium: a former name for niobium
atomic number 41: a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium

Other hypernyms of columbium include Nb, niobium.

columbium (noun)	atomic number 41 (noun)
a former name for niobium	a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium