Rumph rhymes with:
humph, stumph, glymph, humph, lymph, nymph, oomph, schempf, stumph, triomphe, triumph
Rumph sounds like:
rainbow, rambeau, rambo, rambow, ramify, ramp, rampey, rampy, remove, rempe, renminbi, renouf, reunify, rimbey, romanoff, romanov, romp, rump, rumpf, runoff, runup