poorness vs fruitlessness

poorness and fruitlessness both are nouns.

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

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

Other hypernyms of poorness include aridity, barrenness.

poorness (noun)	fruitlessness (noun)
the quality of being poorly made or maintained	the quality of yielding nothing of value
less than adequate	a lack of creative imagination
the quality of being meager
the state of having little or no money and few or no material possessions