scrawniness vs spareness

scrawniness and spareness both are nouns.

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

As nouns, spareness is a hypernym of scrawniness; that is, spareness is a word with a broader meaning than scrawniness:

Other hypernyms of scrawniness include leanness, thinness.

scrawniness (noun)	spareness (noun)
the bodily property of lacking flesh	the property of being scanty or scattered; lacking denseness
the property of being stunted and inferior in size or quality	the property of having little body fat