inactivity vs indolence

inactivity and indolence both are nouns.

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

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

Other hyponyms of inactivity include flatness, languor, lethargy, phlegm, sluggishness, restfulness, passiveness, passivity, laziness.

inactivity (noun)	indolence (noun)
being inactive; being less active	inactivity resulting from a dislike of work
a disposition to remain inactive or inert
the state of being inactive