Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sŏnōrus, a, um (collat. form sŏnōris, e, Diom. 497 and 498), adj. [sonor], noisy, loud, sounding, resounding, sonorous (poet. and in post-Aug. prose for the class. sonans): cithara, Tib. 3, 4, 69: aes, Claud. IV. Cons. Hon. 149: arcus, id. in Ruf. 2, 80: tempestates sonoras, Verg. A. 1, 53: tonitru, Claud. Laud. Stil. 2, 26: pelage, Lucr. 5, 35 Lachm.: flumina, Verg. A. 12, 139: nemus, Stat. Th. 4, 34: Phocis (on account of the Delphic oracle), id. ib. 11, 281: insula fluctibus, Claud. B. Gild. 512: versus qui crepitant pronuntiatione fragosā et exsultantem informant dictionem, ut (Verg. A. 9, 503): at tuba terribilem, etc., Diom. p. 498 P.
* Adv.: sŏnōrē, loudly: oscitavit (with clare), Gell. 4, 20, 8.