sparseness vs scantiness

sparseness and scantiness both are nouns.

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

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

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

sparseness (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.