boron vs atomic number 5

boron and atomic number 5 both are nouns.

Word	Noun	Adjective	Verb	Adverb
boron	Yes	No	No	No
atomic number 5	Yes	No	No	No

As nouns, boron and atomic number 5 are synonyms defined as:

boron and atomic number 5: a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder

Other synonyms of boron include B.

boron (noun)	atomic number 5 (noun)
a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder	a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder