lanthanum vs atomic number 57

lanthanum and atomic number 57 both are nouns.

Word	Noun	Adjective	Verb	Adverb
lanthanum	Yes	No	No	No
atomic number 57	Yes	No	No	No

As nouns, lanthanum and atomic number 57 are synonyms defined as:

lanthanum and atomic number 57: a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth

Other synonyms of lanthanum include La.

lanthanum (noun)	atomic number 57 (noun)
a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth	a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth