Guesstimates rhymes with:
underestimates, underestimates, underestimates, underestimates, damitz, kismets, nemetz, nemitz, nimitz, summits, thermits, underestimates
underestimates, underestimates, underestimates, underestimates, damitz, kismets, nemetz, nemitz, nimitz, summits, thermits, underestimates