liquor vs whiskey

liquor and whiskey both are nouns.

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

As nouns, whiskey is a hyponym of liquor; that is, whiskey is a word with a more specific, narrower meaning than liquor:

liquor (noun)	whiskey (noun)
an alcoholic beverage that is distilled rather than fermented	a liquor made from fermented mash of grain
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