Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
concĭtor, ōris, m. [concieo], he who rouses or excites, an exciter (rare; not in Cic.; in MSS. freq. interchanged with concitator): belli, Liv. 23, 41, 1; 29, 3, 3; 37, 45, 17; Tac. A. 4, 28; id. H. 1, 68; 4, 56; Just. 2, 9, 21: vulgi, Liv. 45, 10 10.