viceleader
nounUK /ˌvaɪsˈliːdə/
US /ˌvaɪsˈliːdər/
A viceleader is the person who helps the leader and takes charge when the leader is away.
When the captain was sick, the viceleader ran the team meeting.
OTHER MEANINGS
2. The second most important person in a group or organization.
She was elected viceleader of the club for the next year.
3. A person who acts for the leader when the leader cannot be present.
The viceleader signed the form while the principal was traveling.
4. A helper who supports the main leader in daily tasks.
As viceleader, he organized the schedule and checked on everyone's progress.