Leaver (noun)

A person who leaves or exits a place or organization; a person who departs or withdraws.

Origin:

From the verb "to leave".

Examples:

1. The leaver quit the company due to personal reasons.
2. The leaver left the party early.
3. The leaver was not happy with the current situation.
4. The leaver was one of the founding members of the organization.
5. The leaver was a respected member of the team.