rummy vs unusual

rummy is a noun but unusual is not a noun.

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

rummy (noun)	unusual (noun)
a card game based on collecting sets and sequences; the winner is the first to meld all their cards
a chronic drinker

rummy (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