penury vs poorness

penury and poorness both are nouns.

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

As nouns, poorness is a hypernym of penury; that is, poorness is a word with a broader meaning than penury:

penury: a state of extreme poverty or destitution
poorness: the state of having little or no money and few or no material possessions

Other hypernyms of penury include impoverishment, poverty.

penury (noun)	poorness (noun)
a state of extreme poverty or destitution	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