niobium vs Nb

niobium and Nb both are nouns.

Word	Noun	Adjective	Verb	Adverb
niobium	Yes	No	No	No
Nb	Yes	No	No	No

As nouns, niobium and Nb are synonyms defined as:

niobium and Nb: a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium

Other synonyms of niobium include atomic number 41.

niobium (noun)	Nb (noun)
a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium	a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium