Molpus' rhymes with:
molpus, molpus, malpass, molpus, negropalpus, all-purpose, bippus, bumpus, campus, chapas, chiapas, compas, compass, coppess, copus, corpus, encompass, eohippus, gyrocompass, hippocampus, hospice, kappus, lapis, lupus, malpass, manglapus, molpus, mopus, multipurpose, negropalpus, oedipus, olympus, opus, pappas, pompous, porpoise, prapas, precipice, purpose, tapas
Molpus' sounds like:
mailbag, mailbags, mailbox, mailboxes, malpass, malveaux, minilabs, molpus, molpus's, muehlebach