Overbuilt rhymes with:
bildt, built, rebuilt, unbuilt, welbilt, bildt, built, gilt, guilt, hilt, jilt, kilt, lilt, milt, quilt, rebuilt, schildt, schilt, silt, spilt, stilt, tilt, unbuilt, welbilt, wildt, wilt
Overbuilt sounds like:
overbilled, overfelt, overfield, overflowed, overplayed, overpopulate, overpopulated, overvalued