Sul-phur, brwmstan, mygfaen

Sul-try, mwrn; tesog

Sum-mer, haf; hafaidd: hafota

Sum-mit, pen, copa, crib; blaen

Sum-mon, gwysio; galw

Sum-mons, gwys, dyfyn

Sun-beam, pelydryn, mychedyn

Sun-day, dydd Sul

Sun-dry, amryw, amrywiol

Sun-rise, codiad haul