Synonyms and related words :
couch, crawl, creep, go on tiptoe, grovel, gumshoe, inch, inch along, lay wait, lie in wait, lurk, noctambulate, pad, prowl, pussyfoot, scrabble, scramble, shadow, sidle, skulk, sleepwalk, slink, snake, sneak, somnambulate, stalk, steal, steal along, tippytoe, tiptoe, worm, worm along