rum vs grog

rum and grog both are nouns.

Word	Noun	Adjective	Verb	Adverb
rum	Yes	Yes	No	No
grog	Yes	No	No	No

As nouns, grog is a hyponym of rum; that is, grog is a word with a more specific, narrower meaning than rum:

Other hyponyms of rum include demerara, demerara rum, Jamaica rum.

rum (noun)	grog (noun)
a card game based on collecting sets and sequences; the winner is the first to meld all their cards	rum cut with water
liquor distilled from fermented molasses

rum (adjective)	grog (adjective)
beyond or deviating from the usual or expected