caudillo(military dictator in South America) noun [UK: ˌkɒ.ˈdɪ.ləʊ] [US: ˌkɒ.ˈdɪlo.ʊ]
chieftain [chieftains](A leader of a clan or tribe) noun [UK: ˈtʃiːf.tən] [US: ˈtʃiːf.tən]
leader [leaders](one having authority) noun [UK: ˈliː.də(r)] [US: ˈliː.dər]He was one of the leaders of the revolution. = Fue uno de los caudillos de la revolución.
spearhead [spearheads](one who leads or initiates an activity) noun [UK: ˈspɪə.hed] [US: ˈspɪr.ˌhed]