cachexy vs feebleness

cachexy and feebleness both are nouns.

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

As nouns, feebleness is a hypernym of cachexy; that is, feebleness is a word with a broader meaning than cachexy:

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

Other hypernyms of cachexy include debility, frailness, frailty, infirmity, valetudinarianism.

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