barium vs atomic number 56

barium and atomic number 56 both are nouns.

Word	Noun	Adjective	Verb	Adverb
barium	Yes	No	No	No
atomic number 56	Yes	No	No	No

As nouns, barium and atomic number 56 are synonyms defined as:

barium and atomic number 56: a soft silvery metallic element of the alkali earth group; found in barite

Other synonyms of barium include Ba.

barium (noun)	atomic number 56 (noun)
a soft silvery metallic element of the alkali earth group; found in barite	a soft silvery metallic element of the alkali earth group; found in barite