whisky vs liquor

whisky and liquor both are nouns.

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

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

Other hypernyms of whisky include booze, hard drink, hard liquor, John Barleycorn, spirits, strong drink.

whisky (noun)	liquor (noun)
a liquor made from fermented mash of grain	an alcoholic beverage that is distilled rather than fermented
	the liquid in which vegetables or meat have been cooked
	a liquid substance that is a solution (or emulsion or suspension) used or obtained in an industrial process