astheny vs feebleness

astheny and feebleness both are nouns.

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

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

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

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

astheny (noun)	feebleness (noun)
an abnormal loss of strength	the quality of lacking intensity or substance
	the state of being weak in health or body (especially from old age)