rum vs unusual

rum is a noun but unusual is not a noun.

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

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

rum (adjective)	unusual (adjective)
beyond or deviating from the usual or expected	not usual or common or ordinary
	being definitely out of the ordinary and unexpected; slightly odd or even a bit weird
	not commonly encountered