arrack vs hard liquor

arrack and hard liquor both are nouns.

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

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

arrack: any of various strong liquors distilled from the fermented sap of toddy palms or from fermented molasses
hard liquor: an alcoholic beverage that is distilled rather than fermented

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

arrack (noun)	hard liquor (noun)
any of various strong liquors distilled from the fermented sap of toddy palms or from fermented molasses	an alcoholic beverage that is distilled rather than fermented