cask vs wine cask

cask and wine cask both are nouns.

Word	Noun	Adjective	Verb	Adverb
cask	Yes	No	No	No
wine cask	Yes	No	No	No

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

Other hyponyms of cask include beer barrel, beer keg, butt, hogshead, keg, pickle barrel, shook, tun, wine barrel.

cask (noun)	wine cask (noun)
a cylindrical container that holds liquids	a barrel that holds wine
the quantity a cask will hold