demonstrator [demonstrators](a person involved in a demonstration) noun [UK: ˈde.mən.streɪ.tə(r)] [US: ˈde.mən.ˌstre.tər]The demonstrators gathered in the square. = Los manifestantes se congregaron en la plaza.
protester [protesters](person who protests) noun [UK: prə.ˈtest.ə(r)] [US: ˈproʊt.est.r̩]