Sn vs carbon group element

Sn and carbon group element both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sn	Yes	No	No	No
carbon group element	Yes	No	No	No

As nouns, carbon group element is a hypernym of Sn; that is, carbon group element is a word with a broader meaning than Sn:

Sn: a silvery malleable metallic element that resists corrosion; used in many alloys and to coat other metals to prevent corrosion; obtained chiefly from cassiterite where it occurs as tin oxide
carbon group element: any chemical element that belongs to the carbon group.

Other hypernyms of Sn include metal, metallic element, crystallogen, Group 14 element, tetragen, tetrel.

Sn (noun)	carbon group element (noun)
a silvery malleable metallic element that resists corrosion; used in many alloys and to coat other metals to prevent corrosion; obtained chiefly from cassiterite where it occurs as tin oxide	any chemical element that belongs to the carbon group.