inactivity vs languor

inactivity and languor both are nouns.

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

As nouns, languor is a hyponym of inactivity; that is, languor is a word with a more specific, narrower meaning than inactivity:

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