rum vs hard drink

rum and hard drink both are nouns.

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

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

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

rum (noun)	hard drink (noun)
a card game based on collecting sets and sequences; the winner is the first to meld all their cards	an alcoholic beverage that is distilled rather than fermented
liquor distilled from fermented molasses

rum (adjective)	hard drink (adjective)
beyond or deviating from the usual or expected