Group 14 element vs Sn

Group 14 element and Sn both are nouns.

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

As nouns, Sn is a hyponym of Group 14 element; that is, Sn is a word with a more specific, narrower meaning than Group 14 element:

Group 14 element: any chemical element that belongs to the carbon group.
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

Other hyponyms of Group 14 element include atomic number 82, lead, Pb, atomic number 50, tin, Fl, flerovium.

Group 14 element (noun)	Sn (noun)
any chemical element that belongs to the carbon group.	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