Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
subjŭgātor, ōris, m. [subjugo], one who brings under the yoke, a conqueror, subjugator (post-Aug.): ORBIS TERRARVM, Inscr. Orell. 838: malorum, App. Dogm. Plat. 2, pp. 16, 17.