opositor

opposition, opposing

From oposición.

opponent; oppositionist; a person who will be taking the civil service entrance examination in order to get a job in the public sector, typically describing someone who's studying full-time by themselves in preparation for the exam; an applicant for a public sector job; a candidate for a public sector job

“Las amenazas se han cumplido. Nada más poner un pie en Rusia, las autoridades han detenido este domingo al destacado opositor Alexéi Navalni en el aeropuerto en el que ha aterrizado.” — The threats have been fulfilled. As soon as he set foot in Russia, the authorities arrested prominent opposition figure Alexei Navalny this Sunday at the airport where he landed.

From oposición.