Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pŭtātor, ōris, m. [puto], a pruner or lopper of trees, Varr. L. L. 6, § 63 Müll.; Plin. 27, 8, 45, § 69; Col. poët. 10, 228: vitis, Ov. M. 14, 649: vitium, Pall. 1, 6, 9.