Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sŏpōrĭfer, fĕra, fĕrum, adj. [sopor-fero], sleep-bringing, inducing sleep, sleepy, drowsy (poet. and in post-Aug. prose): papaver, Verg. A. 4, 486: lac, Plin. 19, 8, 38, § 126: potio, Spart. Hadr. 26 fin.: vis pinnae, Plin. 9, 13, 15, § 42: genus (trychni), id. 21, 31, 105, § 180: somnus, Luc. 3, 8; cf.: aula Somni, Ov. M. 11, 586: nox, Sil. 7, 287; Petr. poët. 128, 6, 1: Lethe, Ov. Tr. 4, 1, 47: vices, Claud. Rapt. Pros. 3, 404.