bourbon vs whisky

bourbon and whisky both are nouns.

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

As nouns, whisky is a hypernym of bourbon; that is, whisky is a word with a broader meaning than bourbon:

bourbon: whiskey distilled from a mash of corn and malt and rye and aged in charred oak barrels
whisky: a liquor made from fermented mash of grain

Other hypernyms of bourbon include whiskey.

bourbon (noun)	whisky (noun)
whiskey distilled from a mash of corn and malt and rye and aged in charred oak barrels	a liquor made from fermented mash of grain