Tastier rhymes with:
nastier, rustier, 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, prettier, rustier, saltier, sportier, thriftier, trottier, whittier
Tastier sounds like:
taster, teaster, tessitore, tester, testor, testuro, texstar, texter, textor, texture, thaxter, tighter, toaster, together, toystore, tschetter, twister