One who is militant for their religion (or irreligion).
An adherent of jihadism.
One who participates in a jihad, an Islamic holy war or conflict; a mujahid.
Pertaining to the Islamic fundamentalist doctrine of jihadism, which advocates armed jihad.
A person employed to fight in an armed conflict who is not a member of the state or military group for which they are fighting and whose primary motivation is private gain.
One hired to engage in a figurative battle, as a corporate takeover, a lawsuit, or a political campaign.
Motivated by private gain.