Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. Nĕmĕa, ae, and Nĕmĕē, ēs, f., = Νεμέη, a city in Argolis, near which Hercules slew the Nemean lion and founded the Nemean games: nec Nemeae nec Olympiae nec usquam, Plaut. Cas. 4, 1, 1; Cic. Fat. 4, 7: Nemeae sub rupe, Verg. A. 8, 295: Nemee frondosa, Mart. Spect. 27: pulvereā Nemeen effervere nube, Stat. Th. 4, 664; id. S. 1, 3, 6.
2. Nemĕa, ae, m., a river flowing between the territories of Corinth and Sicyon, Liv. 33, 15.‡ † nēmen, ĭnis, n., = νῆμα, a yarn, thread: trino de nemine fati, Inscr. Grut. 690, 5; cf. nema.