Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ērŭtor, ōris, m. [eruo], a rescuer: erutor meus es tu, Domine, Vers. Lat. Psa. 69, 6, ap. August. in Psa. 69 (cf.: implicatus sum, erue, August. ib.).