co-host
nounUK /ˌkəʊˈhəʊst/
US /ˌkoʊˈhoʊst/
A co-host is a person who helps run a show together with another person.
The two friends were co-hosts of the morning radio show.
OTHER MEANINGS
2. To share the job of hosting an event or program with someone else.
She will co-host the school talent show with her brother.
3. A person who shares hosting duties at a party or gathering.
As co-host of the party, he greeted guests at the door.
4. A secondary or assistant host on a television or online program.
The co-host introduced the next guest while the main host was away.