schnaps vs hard drink

schnaps and hard drink both are nouns.

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

As nouns, hard drink is a hypernym of schnaps; that is, hard drink is a word with a broader meaning than schnaps:

schnaps: any of various strong liquors especially a Dutch spirit distilled from potatoes
hard drink: an alcoholic beverage that is distilled rather than fermented

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

schnaps (noun)	hard drink (noun)
any of various strong liquors especially a Dutch spirit distilled from potatoes	an alcoholic beverage that is distilled rather than fermented