Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
perturbātor, ōris, m. [perturbo], a disquieter, troubler, disturber (eccl. Lat. for turbator, cf. turbo): ecclesiarum, Sulp. Sev. Hist. Sacr. 2, 49; Ambros. Spirit. Sanc. 3, 17, 121.