sparseness vs leanness

sparseness and leanness both are nouns.

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

As nouns, leanness is a hypernym of sparseness; that is, leanness is a word with a broader meaning than sparseness:

Other hypernyms of sparseness include exiguity, meagerness, meagreness, poorness, scantiness, scantness.

sparseness (noun)	leanness (noun)
the property of being scanty or scattered; lacking denseness	the property of having little body fat
	the quality of being meager