Commodore

Commodore is a military rank used in many navies that is superior to a starfleet captain, but below a rear admiral.

Traditionally, "commodore" is the title for any officer assigned to command more than one ship at a time, even temporarily, much as "captain" is the traditional title for the commanding officer of a single ship even if the officer's official title in the service is a lower rank. As an official rank, a commodore typically commands a flotilla or squadron of ships as part of a larger task force or battlegroup commanded by an admiral.