worm in WordNet English dictionary

1. a person who has a nasty or unethical character undeserving of respect
   worm  louse  insect  dirt ball 
   
2. any of numerous relatively small elongated soft-bodied animals especially of the phyla Annelida and Chaetognatha and Nematoda and Nemertea and Platyhelminthes; also many insect larvae
   worm 
   
3. screw thread on a gear with the teeth of a worm wheel or rack
   worm 
   
4. a software program capable of reproducing itself that can spread from one computer to the next over a network
   "worms take advantage of automatic file sending and receiving features found on many computers"
   worm 
   

1. to move in a twisting or contorted motion, (especially when struggling)
   "The prisoner writhed in discomfort"; "The child tried to wriggle free from his aunt's embrace"
   writhe  wrestle  wriggle  worm  squirm  twist