sucker

a person who is gullible and easy to take advantage of

a shoot arising from a plant's roots

a drinker who sucks (as at a nipple or through a straw)

flesh of any of numerous North American food fishes with toothless jaws

hard candy on a stick

an organ specialized for sucking nourishment or for adhering to objects by suction

mostly North American freshwater fishes with a thick-lipped mouth for feeding by suction; related to carps