poorness vs sparsity

poorness and sparsity both are nouns.

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

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

Other hyponyms of poorness include wateriness, abstemiousness, spareness, sparseness, thinness, thinness.

poorness (noun)	sparsity (noun)
the quality of being poorly made or maintained	the property of being scanty or scattered; lacking denseness
less than adequate
the quality of being meager
the state of having little or no money and few or no material possessions