Pb vs Group 14 element

Pb and Group 14 element both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pb	Yes	No	No	No
Group 14 element	Yes	No	No	No

As nouns, Group 14 element is a hypernym of Pb; that is, Group 14 element is a word with a broader meaning than Pb:

Pb: a soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull grey
Group 14 element: any chemical element that belongs to the carbon group.

Other hypernyms of Pb include metal, metallic element, carbon group element, crystallogen, tetragen, tetrel.

Pb (noun)	Group 14 element (noun)
a unit of information equal to 1000 terabits or 10^15 bits	any chemical element that belongs to the carbon group.
a soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull grey