Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
2. vāgor, ōris, m. [vagio], a sounding, sound: vagorem pro vagitu, Enn. (16, 32): qui clamos oppugnantis vagore volanti, Lucr. (2, 577), Fest. p. 375; cf. Non. 184, 22.