A warrior was a type of fighter.
Leela was the greatest warrior in the history of the Sevateem, who sacrificed her life to save her tribe. (AUDIO: The Catalyst) The Fourth Doctor's companion Leela was named in her honour. (AUDIO: The Catalyst, Arbitration, The Abandoned)
In the language of the Gamma Forests, the word "doctor" meant "mighty warrior". (TV: A Good Man Goes to War) Shortly before his death on Karn, and supposing there wasn't a need for a doctor during the Time War, the Eighth Doctor asked the Sisterhood of Karn to bring him a pre-prepared potion that would make him regenerate into a warrior. (TV: The Night of the Doctor) This next incarnation, the War Doctor, was referred to by Clara Oswald as "the warrior". (TV: The Day of the Doctor) Clara claimed to the Eleventh Doctor that "[w]e've got enough warriors", and what the Eleventh Doctor should do was what he had always done: be a doctor. (TV: The Day of the Doctor)
The Thals were originally a famous race of warriors, but became farmers after the neutronic war on Skaro. The Thal Ganatus wondered if the Daleks had become warriors themselves. (TV: "The Escape") Davros later referred to the Daleks as a warrior race, (TV: The Witch's Familiar) as did the General. (TV: Hell Bent)
Warrior was a caste in the caste systems of the Sensorites on the Sense Sphere (TV: The Sensorites) and the Silurians of Earth. (COMIC: The Lost Dimension) Sensorite warriors were identified by the distinct accessories on the sleeves of their grey bodysuits — namely three black bands on the forearms. One such Warrior arrested the Fourth Sensorite twice. (TV: The Sensorites) In the case of the Silurians, the warrior caste was a distinct subspecies, with Vastra being identified as one by Silurian scholars. (COMIC: The Lost Dimension)