Scotch whisky vs malt whisky

Scotch whisky and malt whisky both are nouns.

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

As nouns, Scotch whisky and malt whisky are synonyms defined as:

Scotch whisky and malt whisky: whiskey distilled in Scotland; especially whiskey made from malted barley in a pot still

Other synonyms of Scotch whisky include malt whiskey, Scotch, Scotch malt whiskey, Scotch malt whisky, Scotch whiskey.

Scotch whisky (noun)	malt whisky (noun)
whiskey distilled in Scotland; especially whiskey made from malted barley in a pot still	whiskey distilled in Scotland; especially whiskey made from malted barley in a pot still