malt whiskey vs Scotch malt whisky

malt whiskey and Scotch malt whisky both are nouns.

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

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

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

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

malt whiskey (noun)	Scotch 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