hard liquor vs strong drink

hard liquor and strong drink both are nouns.

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

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

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

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

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