Chenin blanc vs vinifera

Chenin blanc and vinifera both are nouns.

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

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

Chenin blanc: white grape grown especially in California and the lower Loire valley of France
vinifera: common European grape cultivated in many varieties; chief source of Old World wine and table grapes

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

Chenin blanc (noun)	vinifera (noun)
made in California and the Loire valley in France	common European grape cultivated in many varieties; chief source of Old World wine and table grapes
white grape grown especially in California and the lower Loire valley of France