unworthy vs worthy

unworthy is not a noun while worthy is a noun.

Word	Noun	Adjective	Verb	Adverb
unworthy	No	Yes	No	No
worthy	Yes	Yes	No	No

unworthy (noun)	worthy (noun)
	an important, honorable person (word is often used humorously)

unworthy (adjective)	worthy (adjective)
lacking in value or merit	having worth or merit or value; being honorable or admirable
morally reprehensible	worthy of being chosen especially as a spouse
not deserving	having qualities or abilities that merit recognition in some way