Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† hymnus, i, m., = ὕμνος, a song of praise, a hymn: hymnus cantus est cum laude Dei, Aug. Enarr. in Psa. 148, 17; Ambros. Expos. Psa. 118, prol. § 3; Lucil. ap. Non. 330, 9; Prud. Cath. 37 praef.; 4, 75: divinorum scriptor hymnorum, Lact. 4, 8, 14; Vulg. Psa. 60 tit.; id. Matt. 26, 30.