emaciation vs spareness

emaciation and spareness both are nouns.

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

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

Other hypernyms of emaciation include leanness, thinness.

emaciation (noun)	spareness (noun)
extreme leanness (usually caused by starvation or disease)	the property of being scanty or scattered; lacking denseness
	the property of having little body fat