languor vs inactivity

languor and inactivity both are nouns.

Word	Noun	Adjective	Verb	Adverb
languor	Yes	No	No	No
inactivity	Yes	No	No	No

As nouns, inactivity is a hypernym of languor; that is, inactivity is a word with a broader meaning than languor:

Other hypernyms of languor include inactiveness, inertia.

languor (noun)	inactivity (noun)
inactivity; showing an unusual lack of energy	being inactive; being less active
a relaxed comfortable feeling	a disposition to remain inactive or inert
a feeling of lack of interest or energy	the state of being inactive
oppressively still air