Nether rhymes with:
altogether, birdfeather, feather, get-together, grether, heather, leather, merriweather, raether, sether, tether, together, weather, whether
Nether sounds like:
n'dour, nader, nadir, natter, nature, neater, neathery, nedrow, needier, neider, neither, nethery, netter, netware, neuter, nieder, niederer, nitro, notaro, notary, noteware, nother, notre, notter, nutri, nutria, nutter