arrest vs inaction

arrest and inaction both are nouns.

Word	Noun	Adjective	Verb	Adverb
arrest	Yes	No	Yes	No
inaction	Yes	No	No	No

As nouns, inaction is a hypernym of arrest; that is, inaction is a word with a broader meaning than arrest:

Other hypernyms of arrest include inactiveness, inactivity.

arrest (noun)	inaction (noun)
the act of apprehending (especially apprehending a criminal)	the state of being inactive
the state of inactivity following an interruption

arrest (verb)	inaction (verb)
hold back, as of a danger or an enemy; check the expansion or influence of
take into custody
attract and fix
cause to come to an abrupt stop