Whistle rhymes with:
entwistle, wissel, antimissile, bisel, bissell, bristle, cissell, dismissal, entwistle, epistle, euromissile, fissel, fissell, fissile, glycel, gristle, hisel, kissel, kissell, missal, missel, missile, schissel, sissel, this'll, thistle, wissel
Whistle sounds like:
wachtel, wachtell, weischedel, westall, westley, wickedly, wojdyla