poorness vs sparseness

poorness and sparseness both are nouns.

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

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

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

poorness (noun)	sparseness (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