Amoebas rhymes with:
beeba's, ciba's, rebbe's, toshiba's, baba's, beeba's, ciba's, cordoba's, cordobas, cuba's, dubas, dybas, gibas, guba's, kubas, lubas, mambas, rebbe's, ribas, sabas, simba's, toshiba's, urbas
Amoebas sounds like:
ambac, ambase, ambiguous, ambs, ambush, ambushes, amfac, amfesco, amoebic, ampco, ampex, amphibious