whiskey vs whisky

whiskey and whisky both are nouns.

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

As nouns, whiskey and whisky are synonyms defined as:

whiskey (noun)	whisky (noun)
a liquor made from fermented mash of grain	a liquor made from fermented mash of grain