Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pūtor, ōris, m. [puteo], a foul smell, a stench, rottenness, putridity (ante- and postclass.), Cato, R. R. 157; Varr. L. L. 5, § 25 Müll.; Lucr. 2, 872; 6, 1101; Stat. S. 4, 3, 86; Arn. 7, 222 al.; App. M. 4, p. 144, 4.