Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
faenĕrātĭo (less correctly fēn-, foen-), ōnis, f. [faeneror], a lending on interest, usury (class.): haec pecunia tota ab honoribus translata est in quaestum et faenerationem, Cic. Fl. 23, 56: nec enim, si tuam ob causam cuiquam commodes, beneficium illud habendum est, sed faeneratio, id. Fin. 2, 35, 117; id. Verr. 2, 3, 72, § 168; Col. 1 praef. § 8.