Rhenish vs white wine

Rhenish and white wine both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rhenish	Yes	Yes	No	No
white wine	Yes	No	No	No

As nouns, white wine is a hypernym of Rhenish; that is, white wine is a word with a broader meaning than Rhenish:

Rhenish: any of several white wines from the Rhine River valley in Germany (`hock' is British usage)
white wine: pale yellowish wine made from white grapes or red grapes with skins removed before fermentation

Rhenish (noun)	white wine (noun)
any of several white wines from the Rhine River valley in Germany (`hock' is British usage)	pale yellowish wine made from white grapes or red grapes with skins removed before fermentation

Rhenish (adjective)	white wine (adjective)
of or relating to the Rhine River and the lands adjacent to it