Irish whiskey vs Irish whisky

Irish whiskey and Irish whisky both are nouns.

Word	Noun	Adjective	Verb	Adverb
Irish whiskey	Yes	No	No	No
Irish whisky	Yes	No	No	No

As nouns, Irish whiskey and Irish whisky are synonyms defined as:

Irish whiskey and Irish whisky: whiskey made in Ireland chiefly from barley

Other synonyms of Irish whiskey include Irish.

Irish whiskey (noun)	Irish whisky (noun)
whiskey made in Ireland chiefly from barley	whiskey made in Ireland chiefly from barley