WordNet sense 1 (someone unpleasantly strange or eccentric):

spook, weirdo, weirdie, weirdy

WordNet sense 2 (show submission or fear):

cower, crawl, cringe, fawn, grovel

WordNet sense 3 (grow in such a way as to cover (a building)):

grow over

WordNet sense 4 (to go stealthily or furtively):

mouse, pussyfoot, sneak

WordNet sense 5 (a slow mode of locomotion on hands and knees or dragging the body):

creeping, crawling