THESAURUS
morass
anarchy, baygall, bind, bog, bottom, bottomland, bottoms, buffalo wallow, chaos, clutch, complication, confusion, crunch, dunghill, embarrassing position, embarrassment, entanglement, everglade, fabulous formless darkness, fen, fenland, fine how-do-you-do, foul-up, glade, hassle, hell to pay, hobble, hog wallow, holm, hot water, how-do-you-do, imbroglio, jam, jungle, knot, labyrinth, license, marais, marish, marsh, marshland, meadow, mere, mesh, mess, mire, misrule, mix, mix-up, moor, moorland, moss, mud, mud flat, muddle, parlous straits, pass, peat bog, pickle, pinch, plight, predicament, pretty pass, pretty pickle, pretty predicament, quag, quagmire, quicksand, salt marsh, scrape, screw-up, skein, slob land, slough, snafu, snarl, sough, spot, squeeze, stew, sticky wicket, strait, straits, sump, swale, swamp, swampland, taiga, tangle, tight spot, tight squeeze, tightrope, tricky spot, unholy mess, view, wallow, wash, web
ROGET THESAURUS
morass
Marsh
N
marsh, swamp,
morass, marish, moss, fen, bog, quagmire, slough, sump, wash, mud, squash, slush, baygall, cienaga, jhil, vlei, marsh, marshy, swampy, boggy, plashy, poachy, quaggy, soft, muddy, sloppy, squashy, paludal, moorish, moory, fenny.