Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sprētor, ōris, m. [sperno], a despiser, disdainer, scorner, contemner (poet. and very rare): deorum, Ov. M. 8, 613: morarum, Nemes. Cyn. 79: matronalium amplexuum, App. M. 3, p. 137, 39.