hard liquor vs liquor

hard liquor and liquor both are nouns.

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

As nouns, hard liquor and liquor are synonyms defined as:

hard liquor and liquor: an alcoholic beverage that is distilled rather than fermented

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

hard liquor (noun)	liquor (noun)
an alcoholic beverage that is distilled rather than fermented	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