Pompous rhymes with:
compas, bumpus, campus, compas, compass, encompass, gyrocompass, hippocampus, olympus, all-purpose, bippus, bumpus, campus, chapas, chiapas, compas, compass, coppess, copus, corpus, encompass, eohippus, gyrocompass, hippocampus, hospice, kappus, lapis, lupus, malpass, manglapus, molpus, molpus', mopus, multipurpose, negropalpus, oedipus, olympus, opus, pappas, porpoise, prapas, precipice, purpose, tapas
Pompous sounds like:
pampas, papenfuss, pimps, pumps