Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
nōmĭnātīvus, a, um, adj. [nomino], of or belonging to naming, nominative; in gram.: casus nominativus, the nominative case, Varr. L. L. 10, § 23 Müll.; Quint. 1, 7, 3; 7, 9, 13; 8, 3, 46 et saep.