sparsity vs scantiness

sparsity and scantiness both are nouns.

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

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

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

sparsity (noun)	scantiness (noun)
the property of being scanty or scattered; lacking denseness	the quality of being meager
	Of a garment, the property of being very small, light, or revealing.