sparsity vs scantness

sparsity and scantness both are nouns.

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

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

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

sparsity (noun)	scantness (noun)
the property of being scanty or scattered; lacking denseness	the quality of being meager