Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
2. Nar, Nartis; only plur., Nartes, ium, m., dwellers on the banks of the Nar: Interamnates, cognomine Nartes, Plin. 3, 14, 19, § 113; gen.: Interamnatium Nartium, Inscr. Grut. 407, 1.
Nartes, ĭum, m., v. 2, Nar.