Dirtier rhymes with:
altier, carpentier, cartier, chartier, cloutier, cottier, courtier, emptier, flightier, fortier, gautier, heartier, heftier, loftier, meatier, meteor, mightier, mintier, mortier, nastier, palmatier, parmentier, peltier, portier, potier, prettier, rustier, saltier, sportier, tastier, thriftier, trottier, whittier
Dirtier sounds like:
dardar, darter, dedeurwaerder, deirdre, deridder, deruiter, deruyter, drotar