Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Sŏdŏma, ōrum, n., = Σόδομα (Heb. [??]), the city of Sodom in Palestine, Tert. Apol. 40; Vulg. Gen. 14, 2.
Called also Sŏdŏma, ae, f., Sulp. Sev. Hist. Sacr. 1, 6; Sedul. 1, 105; Vulg. Gen. 10, 19; also Sŏdŏmum, i, n., Sol. 35; and Sŏdŏmi, ōrum, m., Tert. Carm. Sodom. 127 and 163.
Hence,