thinness vs sparseness

thinness and sparseness both are nouns.

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

As nouns, thinness and sparseness are synonyms defined as:

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

Other synonyms of thinness include spareness, sparsity.

thinness (noun)	sparseness (noun)
the property of having little body fat	the property of being scanty or scattered; lacking denseness
relatively small dimension through an object as opposed to its length or width
a consistency of low viscosity
the property of being very narrow or thin
the property of being scanty or scattered; lacking denseness
The property of lacking substance or strength.