Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prō-nōmen, ĭnis, n.; in gram., a pronoun, Varr. L. L. 8, § 45 Müll.; Quint. 1, 4, 19; 1, 5, 47; 26; 11, 3, 87 et saep.
prōnōmĭno, āre, v. a. [pronomen]; in gram., to designate a person by a pronoun, Prisc. p. 1064 P.