sparsity vs sparseness

sparsity and sparseness both are nouns.

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

As nouns, sparsity and sparseness are synonyms defined as:

sparsity and sparseness: the property of being scanty or scattered; lacking denseness

Other synonyms of sparsity include spareness, thinness.

sparsity (noun)	sparseness (noun)
the property of being scanty or scattered; lacking denseness	the property of being scanty or scattered; lacking denseness