Niobite rhymes with:
kilobyte, backbite, exabyte, frostbite, gigabyte, jacobite, kilobyte, megabyte, snakebite, soundbite
Niobite sounds like:
nabbed, nafta, naivete, naphtha, napped, neft, neophyte, nevada, nevitt, nifty, nipped, nobody, nobody'd, nobuto, nonfat, nonfood, novato, numbed