Fleet commander

From Memory Alpha, the free Star Trek reference

Fleet commander was a position in the Vulcan military, in charge of overseeing fleets on the front lines. The fleet commander reported directly to the Vulcan High Command.

In 2154, Minister Kuvak contacted the fleet commander in order to withdraw the Vulcan ships in the Battle of Andoria. (ENT: "Kir'Shara")

Fleet commander is presumably equivalent to a fleet captain or a fleet admiral.