WordNet (r) 3.0 (2006):

shit
    n 1: obscene terms for feces [syn: crap, dirt, shit,
         shite, poop, turd]
    2: obscene words for unacceptable behavior; "I put up with a lot
       of bullshit from that jerk"; "what he said was mostly bull"
       [syn: bullshit, bull, Irish bull, horseshit, shit,
       crap, dogshit]
    3: a small worthless amount; "you don't know jack" [syn: jack,
       doodly-squat, diddly-squat, diddlysquat, diddly-shit,
       diddlyshit, diddly, diddley, squat, shit]
    4: a coarse term for defecation; "he took a shit" [syn: shit,
       dump]
    5: insulting terms of address for people who are stupid or
       irritating or ridiculous [syn: asshole, bastard,
       cocksucker, dickhead, shit, mother fucker,
       motherfucker, prick, whoreson, son of a bitch, SOB]
    6: something of little value; "his promise is not worth a damn";
       "not worth one red cent"; "not worth shucks" [syn: damn,
       darn, hoot, red cent, shit, shucks, tinker's
       damn, tinker's dam]
    v 1: give away information about somebody; "He told on his
         classmate who had cheated on the exam" [syn: denounce,
         tell on, betray, give away, rat, grass, shit,
         shop, snitch, stag]
    2: have a bowel movement; "The dog had made in the flower beds"
       [syn: stool, defecate, shit, take a shit, take a
       crap, ca-ca, crap, make]

Moby Thesaurus II by Grady Ward, 1.0:

241 Moby Thesaurus words for "shit":
   Amytal, Amytal pill, BM, Demerol, Dolophine, H, Luminal,
   Luminal pill, M, Mickey Finn, Nembutal, Nembutal pill, SOB,
   Seconal, Seconal pill, Tuinal, Tuinal pill, a continental, a curse,
   a damn, a darn, a hoot, alcohol, amobarbital sodium, analgesic,
   anodyne, asshole, bagatelle, baloney, barb, barbiturate,
   barbiturate pill, bastard, bauble, bean, bibelot, bilge, bit,
   black stuff, blah, blah-blah, bloody flux, blue, blue angel,
   blue devil, blue heaven, blue velvet, bop, bosh, bowel movement,
   brass farthing, buffalo chips, bugger, bull, bullshit, bunk,
   bunkum, button, ca-ca, calmative, catharsis, cent, chloral hydrate,
   codeine, codeine cough syrup, coprolite, coprolith, cow chips,
   cow flops, cow pats, crap, creep, cur, curio, defecate, defecation,
   dejection, depressant, depressor, diarrhea, dingleberry, dog,
   dolly, downer, droppings, dung, dysentery, evacuate, evacuation,
   farce, fart, farthing, feather, feces, feculence, fig, flapdoodle,
   fleabite, flux, folderol, fribble, frippery, gas, gaud, gewgaw,
   gimcrack, goofball, guano, guff, gup, hair, halfpenny, hard stuff,
   heel, heroin, hill of beans, hogwash, hokum, hood, hooey, hooligan,
   hop, horse, hot air, hypnotic, jakes, jerk, jest, joke, junk,
   kickshaw, knickknack, knickknackery, knockout drops, laudanum,
   lientery, liquor, loose bowels, lotus, louse, malarkey, manure,
   meanie, meperidine, methadone, minikin, mockery, molehill,
   moonshine, morphia, morphine, mother, movement, narcotic,
   night soil, number two, opiate, opium, ordure, pacifier,
   pain killer, paregoric, pen yan, peppercorn, phenobarbital,
   phenobarbital sodium, picayune, piffle, pill, pin, pinch of snuff,
   pinprick, poppycock, prick, purgation, purge, purple heart,
   quietener, rainbow, rap, rat, red, red cent, rot, row of pins,
   rubbish, runs, rush, scag, scat, scum, secobarbital sodium,
   sedative, sewage, sewerage, shithead, shitheel, shits, skunk,
   sleep-inducer, sleeper, sleeping draught, sleeping pill, smack,
   snake, snap, sneeshing, sodium thiopental, somnifacient, soother,
   soothing syrup, soporific, sou, stinkard, stinker, stool, straw,
   take a shit, tar, toad, tommyrot, toy, tranquilizer, trifle,
   trinket, tripe, triviality, trots, tuppence, turd, turistas, turps,
   two cents, twopence, void, voidance, whim-wham, white stuff, wind,
   yellow, yellow jacket