Warlord (title)

A warlord was a type of military and political leader. Some hierarchies and polities included a formal title of Warlord or War Lord, including the early Daleks.

As descriptor
In 1911, an alliance of Nationalist warlords led by Sun Yat Sen launched a revolution against the young Chinese Emperor, Pu Yi, and the ailing Chinese Empire. The alliance formed into the Kuomintang and became the governing party of republican China. (PROSE: The Shadow of Weng-Chiang)

While exploring the Known Worlds, Marcus Americanius Scriptor identified Adolf Hitler as Germany's warlord throughout many different universes of Germania. (PROSE: Warlords of Utopia)

As title
Broton acted as Warlord of the Zygons. (TV: Terror of the Zygons)

Kygon Brox was a Sontaran warlord and commander of the Eighth Battle Fleet. (COMIC: The Instruments of War)

The rank of War Lord was given to a normal Ice Warriors with slightly more importance. (PROSE: Doctor Who and the Ice Warriors)

Prior to the explosion of the neutron bomb on Skaro, the War Minister of the Daleks, Zolfian, assassinated Drenz and briefly ruled the humanoid ancestors of the Daleks as their War Lord. (COMIC: Genesis of Evil) Even after the mutation, the title was kept in the Dalek Empire's hierarchy, albeit now second to the Dalek Emperor; the Black Dalek Leader served as the Golden Emperor's Warlord. (COMIC: The Secret of the Emperor)

The species of "aliens" who organised the War Games with the help of a Renegade Time Lord going by the War Chief had a leader known only by the name of "the War Lord". (TV: The War Games) According to some accounts, memebers of the species were themselves known as "the War Lords", to match the Time Lords. (PROSE:  Exodus)