poor vs poorness

poor and poorness both are nouns.

Word	Noun	Adjective	Verb	Adverb
poor	Yes	Yes	No	No
poorness	Yes	No	No	No

poor (noun)	poorness (noun)
people without possessions or wealth (considered as a group)	the quality of being poorly made or maintained
	less than adequate
	the quality of being meager
	the state of having little or no money and few or no material possessions

poor (adjective)	poorness (adjective)
having little money or few possessions
lacking in quality or substances
characterized by or indicating poverty
of insufficient quantity to meet a need
deserving or inciting pity