Vitis vinifera vs vinifera

Vitis vinifera and vinifera both are nouns.

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

As nouns, Vitis vinifera and vinifera are synonyms defined as:

Vitis vinifera and vinifera: common European grape cultivated in many varieties; chief source of Old World wine and table grapes

Other synonyms of Vitis vinifera include common grape vine, vinifera grape.

Vitis vinifera (noun)	vinifera (noun)
common European grape cultivated in many varieties; chief source of Old World wine and table grapes	common European grape cultivated in many varieties; chief source of Old World wine and table grapes