asthenia vs debility

asthenia and debility both are nouns.

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

As nouns, debility is a hypernym of asthenia; that is, debility is a word with a broader meaning than asthenia:

asthenia: an abnormal loss of strength
debility: the state of being weak in health or body (especially from old age)

Other hypernyms of asthenia include feebleness, frailness, frailty, infirmity, valetudinarianism.

asthenia (noun)	debility (noun)
an abnormal loss of strength	the state of being weak in health or body (especially from old age)