sparsity vs poorness

sparsity and poorness both are nouns.

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

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

Other hypernyms of sparsity include exiguity, leanness, meagerness, meagreness, scantiness, scantness.

sparsity (noun)	poorness (noun)
the property of being scanty or scattered; lacking denseness	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