Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Prŏca, ae, m., v. Procas.
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.