Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
advector, ōris, m. [adveho], one who conveys or carries a thing to a place, a carrier: advector equus, App. Flor. p. 363 (but in Plaut. As. 2, 2, 92, the correct reading is adventorem, Fleck.).