sparseness vs spareness

sparseness and spareness both are nouns.

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

As nouns, sparseness and spareness are synonyms defined as:

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

Other synonyms of sparseness include sparsity, thinness.

sparseness (noun)	spareness (noun)
the property of being scanty or scattered; lacking denseness	the property of being scanty or scattered; lacking denseness
	the property of having little body fat