debility vs wasting

debility and wasting both are nouns.

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

As nouns, wasting is a hyponym of debility; that is, wasting 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)
wasting: 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, cachexy, sickliness.

debility (noun)	wasting (noun)
the state of being weak in health or body (especially from old age)	a decrease in size of an organ caused by disease or disuse
	any general reduction in vitality and strength of body and mind resulting from a debilitating chronic disease