Chenin blanc vs Vitis vinifera

Chenin blanc and Vitis vinifera both are nouns.

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

As nouns, Vitis vinifera is a hypernym of Chenin blanc; that is, Vitis 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
Vitis 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, vinifera grape.

Chenin blanc (noun)	Vitis 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