Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
rĕceptātor, ōris, m. [recepto], a receiver, shelterer; in a bad sense, a hider, harborer, concealer (post-class.): (Rhenus) receptator hostium atque defensor, Flor. 3, 10, 9: de receptatoribus, Dig. 47, 16; 1, 15, 3; cf. receptor.