Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sŭsurrātor, ōris, m. [1. susurro], a mutterer, whisperer, tale-bearer, Cael. ap. Cic. Fam. 8, 1, 4; Vulg. Ecclus, 5, 17.