Prettier rhymes with:
whittier, altier, carpentier, cartier, chartier, cloutier, cottier, courtier, dirtier, emptier, flightier, fortier, gautier, heartier, heftier, loftier, meatier, meteor, mightier, mintier, mortier, nastier, palmatier, parmentier, peltier, portier, potier, rustier, saltier, sportier, tastier, thriftier, trottier, whittier
Prettier sounds like:
parador, paratore, porter, portera, portier, portray, praetor, prater, prather, praytor, predator, predatory, pretoria, prothero, prothro, prouder, prudery, prueter