Extel rhymes with:
nextel, nextel, nextel, alcatel, alltel, bortel, cantel, centel, contel, elcotel, fichtel, gintel, italtel, itel, lortel, martel, martell, microtel, minitel, mitel, moertel, mtel, nextel, novotel, oftel, pactel, picturetel, sawtell, seitel, skytel, teitell, unitel, wiltel, zehntel
Extel sounds like:
eastdil, ekdahl, estel, estell, estella, estelle, estill, estle, exactly, excitedly, exquisitely, extol