Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Sancus, i, m., a deity of the Sabines, also worshipped at Rome; the same as Dius Fidius and Semo, Varr. L. L. 5, § 66 Müll.; Ov. F. 6, 213 sq.; Liv. 8, 20; 32, 1; Prop. 4 (5), 9, 74 (Müll. sanctus); Sil. 8, 422; Fest. s. v. praedia, p. 238 Müll.; id. s. v. propter, p. 229 ib.; Lact. 1, 15, 8; Aug. Civ. Dei, 18, 19; and v. Semo.