sparsity vs leanness

sparsity and leanness both are nouns.

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

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

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

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