whisky vs malt whisky

whisky and malt whisky both are nouns.

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

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

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

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