non-involvement vs nonparticipation

non-involvement and nonparticipation both are nouns.

Word	Noun	Adjective	Verb	Adverb
non-involvement	Yes	No	No	No
nonparticipation	Yes	No	No	No

As nouns, non-involvement and nonparticipation are synonyms defined as:

non-involvement and nonparticipation: withdrawing from the activities of a group

Other synonyms of non-involvement include non-engagement.

non-involvement (noun)	nonparticipation (noun)
withdrawing from the activities of a group	withdrawing from the activities of a group