Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
circumspector, ōris, m. [circumspicio], a watcher, watchman, spy (late Lat.): septem circumspectores sedentes in excelso ad speculandum, Vulg. Ecclus. 37, 18: Deus, i. e. all-seeing, id. ib. 7, 12.