co-leader
nounUK /ˌkəʊˈliːdə/
US /ˌkoʊˈliːdər/
A co-leader is a person who leads a group together with another person.
Mia and Sam are co-leaders of the school art club.
OTHER MEANINGS
2. A person who shares the top position in a company or organization with another person.
The two co-leaders made all the big decisions together.
3. A player who helps lead a sports team along with the captain.
As co-leader of the team, Leo encouraged his teammates.
4. A person who guides an activity or project alongside someone else.
She was a co-leader of the science project.
5. One of two or more people who guide a discussion or meeting together.
The co-leaders kept the meeting friendly and on time.