Pinot vs Pinot noir

Pinot and Pinot noir both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pinot	Yes	No	No	No
Pinot noir	Yes	No	No	No

As nouns, Pinot noir is a hyponym of Pinot; that is, Pinot noir is a word with a more specific, narrower meaning than Pinot:

Pinot: any of several purple or white wine grapes used especially for Burgundies and champagnes
Pinot noir: red wine grape; grown especially in California for making wines resembling those from Burgundy, France

Other hyponyms of Pinot include Pinot blanc.

Pinot (noun)	Pinot noir (noun)
any of several purple or white wine grapes used especially for Burgundies and champagnes	dry red California table wine made from purple Pinot grapes
	red wine grape; grown especially in California for making wines resembling those from Burgundy, France