Pb vs atomic number 82

Pb and atomic number 82 both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pb	Yes	No	No	No
atomic number 82	Yes	No	No	No

As nouns, Pb and atomic number 82 are synonyms defined as:

Pb and atomic number 82: a soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull grey

Other synonyms of Pb include lead.

Pb (noun)	atomic number 82 (noun)
a unit of information equal to 1000 terabits or 10^15 bits	a soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull grey
a soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull grey