hard liquor vs hard drink

hard liquor and hard drink both are nouns.

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

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

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

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

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