From WordNet (r) 3.0 (2006):
crawler
n 1: a person who tries to please someone in order to gain a
personal advantage [syn: sycophant, toady, crawler,
lackey, ass-kisser]
2: a person who crawls or creeps along the ground [syn:
crawler, creeper]
3: terrestrial worm that burrows into and helps aerate soil;
often surfaces when the ground is cool or wet; used as bait
by anglers [syn: earthworm, angleworm, fishworm,
fishing worm, wiggler, nightwalker, nightcrawler,
crawler, dew worm, red worm]