Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Prŏcas and Prŏca, ae, m., a king of Alba: Proca Numitorem atque Amulium procreat, Liv. 1, 3, 9; Ov M. 14, 622; id. F. 4, 52; 6, 143: proximus ille Procas, Verg. A. 6, 767.