Warleader was a designation employed by the Yuuzhan Vong's warrior caste. This was an informal designation applied in a pair of situations. Firstly, it was used for Yuuzhan Vong Commanders overseeing a specific war theater, but who hadn't yet been escalated to the position of Supreme Commander. Secondly, it denoted the individuals leading smaller units, such as squadrons and platoons.
Additionally, Garn utilized Warleader as his title when commanding the warriors of the One.