vigilante
/bixiˈlante/ · B2 · adj
watchful, alert, wakeful
👀💂 Same root as English vigilant: Latin vigilare, to keep watch
Latin vigil means awake, the same root as an all-night vigil. In Spanish, vigilante is mostly an adjective meaning watchful or alert, and also a noun for a guard or watchman. It does not carry the English sense of a self-appointed avenger.