rum vs hard liquor

rum and hard liquor both are nouns.

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

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

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

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