sour mash vs sour mash whiskey

sour mash and sour mash whiskey both are nouns.

Word	Noun	Adjective	Verb	Adverb
sour mash	Yes	No	No	No
sour mash whiskey	Yes	No	No	No

As nouns, sour mash and sour mash whiskey are synonyms defined as:

sour mash (noun)	sour mash whiskey (noun)
any whiskey distilled from sour mash	any whiskey distilled from sour mash
a mash with optimum acidity for yeast fermentation; a mixture of old and new mash; used in distilling some whiskeys