Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
lignātor, ōris, m. [lignor], a wood-cutter, one sent to get wood: oppressis lignatoribus, Caes. B. G. 5, 26: legio tertia, quae pabulatores et lignatores tueretur, Liv. 41, 1, 7.