Omnibus rhymes with:
barnabas, cannabis, barnabas, cannabis, harquebus, syllabus, airbus, albus, barnabas, bierbusse, bulbous, cannabis, columbus, columbus', debose, faubus, globus, harquebus, ibis, jacobus, kobus, nimbus, paribas, phebus, phoebus, pluribus, rebus, sorbus, syllabus, turbas, vobis