WordNet (r) 3.0 (2006):

gook
    n 1: any thick, viscous matter [syn: sludge, slime, goo,
         goop, gook, guck, gunk, muck, ooze]
    2: (slang) a disparaging term for an Asian person (especially
       for North Vietnamese soldiers in the Vietnam War) [syn:
       gook, slant-eye]

Moby Thesaurus II by Grady Ward, 1.0:

97 Moby Thesaurus words for "gook":
   American Indian, Amerind, Australian aborigine, Bushman, Caucasian,
   Indian, Malayan, Mister Charley, Mongolian, Negrillo, Negrito,
   Negro, Oriental, Red Indian, WASP, albumen, baloney, batter, bilge,
   black, black man, blackfellow, bonnyclabber, boy, brown man,
   burrhead, butter, cab, clabber, colored person, coon, cornstarch,
   crap, cream, curd, darky, dough, drivel, egg white, gaum, gel,
   gelatin, glair, glop, glue, gluten, goo, goop, gruel, gumbo, gunk,
   hogwash, honky, hooey, jam, jell, jelly, jigaboo, jungle bunny,
   loblolly, malarkey, molasses, mucilage, muck, mucus, nigger,
   niggra, ofay, paleface, pap, paste, porridge, pudding, pulp, puree,
   putty, pygmy, red man, redskin, rob, rot, semifluid, semiliquid,
   size, slant-eye, soup, spade, starch, sticky mess, syrup, the Man,
   trash, treacle, white, white man, whitey, yellow man