participation n. The process or fact of sharing in an action, sentiment, etc.; (now esp.) active involvement in a matter or event, esp. one in which the outcome directly affects those taking part. Frequently with in.
parˈticipance n. rare = participancy n.
parˈticipancy n. the fact or quality of participating in something.
The word "participation" is far more common than the latter two. This answer lays out a distinction between participation and participancy, but I am still unclear if participance can be differentiated between participation.
What is the difference between the word "participation" and the word "participance"?