rotten vs rottenness

rotten is not a noun while rottenness is a noun.

Word	Noun	Adjective	Verb	Adverb
rotten	No	Yes	No	No
rottenness	Yes	No	No	No

rotten (noun)	rottenness (noun)
	the quality of rotting and becoming putrid
	in a state of progressive putrefaction

rotten (adjective)	rottenness (adjective)
having decayed or disintegrated; usually implies foulness
damaged by decay; hence unsound and useless
very bad