non-engagement vs nonparticipation

non-engagement and nonparticipation both are nouns.

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

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

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

Other synonyms of non-engagement include non-involvement.

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