hard drink vs liquor

hard drink and liquor both are nouns.

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

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

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

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

hard drink (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