sucker in WordNet English dictionary

1. hard candy on a stick
   lollipop  sucker  all-day sucker 
   
2. a person who is gullible and easy to take advantage of
   chump  fool  gull  mark  patsy  fall guy  sucker  soft touch  mug 
   
3. mostly North American freshwater fishes with a thick-lipped mouth for feeding by suction; related to carps
   sucker 
   
4. an organ specialized for sucking nourishment or for adhering to objects by suction
   sucker 
   
5. flesh of any of numerous North American food fishes with toothless jaws
   sucker 
   
6. a drinker who sucks (as at a nipple or through a straw)
   sucker 
   
7. a shoot arising from a plant's roots
   sucker