leanness vs spareness

leanness and spareness both are nouns.

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

As nouns, leanness and spareness are synonyms defined as:

Other synonyms of leanness include thinness.

As nouns, spareness is a hyponym of leanness; that is, spareness is a word with a more specific, narrower meaning than leanness:

Other hyponyms of leanness include wateriness, abstemiousness, sparseness, sparsity, thinness, thinness.

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