inferiority vs poorness

inferiority and poorness both are nouns.

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

As nouns, poorness is a hyponym of inferiority; that is, poorness is a word with a more specific, narrower meaning than inferiority:

Other hyponyms of inferiority include scrawniness, scrubbiness, second class, wretchedness.

inferiority (noun)	poorness (noun)
an inferior quality	the quality of being poorly made or maintained
the quality of being a competitive disadvantage	less than adequate
the state of being inferior	the quality of being meager
	the state of having little or no money and few or no material possessions