debility vs cachexy

debility and cachexy both are nouns.

Word	Noun	Adjective	Verb	Adverb
debility	Yes	No	No	No
cachexy	Yes	No	No	No

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

debility: the state of being weak in health or body (especially from old age)
cachexy: any general reduction in vitality and strength of body and mind resulting from a debilitating chronic disease

Other hyponyms of debility include asthenia, astheny, cachexia, wasting, sickliness.

debility (noun)	cachexy (noun)
the state of being weak in health or body (especially from old age)	any general reduction in vitality and strength of body and mind resulting from a debilitating chronic disease