Rhine wine vs white wine

Rhine wine and white wine both are nouns.

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

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

Rhine wine: 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

Rhine wine (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