Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† gĕnĕālŏgus, i, m., = γενεαλόγος, a genealogist: qui (dii) genealogis antiquis sic nominantur, Cic. N. D. 3, 17, 44. So of Moses, as the author of Genesis: illud ait genealogus idem, Prud. Apoth. 315.