malt whisky vs whisky

malt whisky and whisky both are nouns.

Word	Noun	Adjective	Verb	Adverb
malt whisky	Yes	No	No	No
whisky	Yes	No	No	No

As nouns, whisky is a hypernym of malt whisky; that is, whisky is a word with a broader meaning than malt whisky:

malt whisky: whiskey distilled in Scotland; especially whiskey made from malted barley in a pot still
whisky: a liquor made from fermented mash of grain

Other hypernyms of malt whisky include whiskey.

malt whisky (noun)	whisky (noun)
whiskey distilled in Scotland; especially whiskey made from malted barley in a pot still	a liquor made from fermented mash of grain