Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mūnītor, ōris, m. [1. munio], a fortifier, a worker on fortifications, an engineer, miner, etc. (not in Cic. or Cæs.), Tac. A. 1, 64: qui pro munitoribus armati steterant (al. munitionibus), Liv. 7, 23: munitorum numerus, miners, id. 5, 19, 11.
Poet.: Trojae, i. e. Apollo, the builder of the walls of Troy, Ov. H. 5, 139.