asthenia vs valetudinarianism

asthenia and valetudinarianism both are nouns.

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

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

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

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

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