Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
părăsītor. āri, v. dep. [parasitus], to play the parasite, to sponge: parasitarier, Plaut. Stich. 4, 2, 54: parasitando pascere ventres suos, id. Pers. 1, 2, 3.