Grether rhymes with:
raether, altogether, birdfeather, feather, get-together, heather, leather, merriweather, nether, raether, sether, tether, together, weather, whether
Grether sounds like:
gaarder, garter, girder, gorder, gortari, gorter, grader, grater, greater, greditor, greedier, greider, grider, grieder, gritter, grotheer, gryder