Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
phĭlŏsŏphor, ātus, 1, v. dep. n. [philosophus], to apply one’s self to philosophy, to play the philosopher, to philosophize (class.): philosophatur quoque jam, non mendax modo’st, Plaut. Capt. 2, 2, 34; id. Ps. 4, 2, 18: philosophari est mihi necesse, at paucis, Enn. ap. Cic. Tusc. 2, 1, 1 (cited periphrastically ap. Cic. Rep. 1, 18, 30; id. de Or. 2, 37, 156; Gell. 5, 15 fin.; cf. Trag. Rel. v. 417 Vahl., and p. 53 Rib.); Cic. Tusc. 1, 37, 89; id. N. D. 1, 3, 6: sed jam satis est philosophatum, Plaut. Ps. 2, 3, 21.