Merlot vs red wine

Merlot and red wine both are nouns.

Word	Noun	Adjective	Verb	Adverb
Merlot	Yes	No	No	No
red wine	Yes	No	No	No

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

Merlot: dry red wine made from a grape grown widely in Bordeaux and California
red wine: wine having a red color derived from skins of dark-colored grapes

Merlot (noun)	red wine (noun)
dry red wine made from a grape grown widely in Bordeaux and California	wine having a red color derived from skins of dark-colored grapes
black wine grape originally from the region of Bordeaux