Sauvignon blanc vs vinifera

Sauvignon blanc and vinifera both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sauvignon blanc	Yes	No	No	No
vinifera	Yes	No	No	No

As nouns, vinifera is a hypernym of Sauvignon blanc; that is, vinifera is a word with a broader meaning than Sauvignon blanc:

Sauvignon blanc: white wine grape grown in California
vinifera: common European grape cultivated in many varieties; chief source of Old World wine and table grapes

Other hypernyms of Sauvignon blanc include common grape vine, vinifera grape, Vitis vinifera.

Sauvignon blanc (noun)	vinifera (noun)
a California wine	common European grape cultivated in many varieties; chief source of Old World wine and table grapes
white wine grape grown in California