suck vs sucker

suck and sucker both are nouns.

Word	Noun	Adjective	Verb	Adverb
suck	Yes	No	Yes	No
sucker	Yes	No	No	No

suck (noun)	sucker (noun)
the act of sucking	mostly North American freshwater fishes with a thick-lipped mouth for feeding by suction; related to carps
	an organ specialized for sucking nourishment or for adhering to objects by suction
	hard candy on a stick
	flesh of any of numerous North American food fishes with toothless jaws
	a drinker who sucks (as at a nipple or through a straw)
	a person who is gullible and easy to take advantage of
	a shoot arising from a plant's roots

suck (verb)	sucker (verb)
give suck to
draw into the mouth by creating a practical vacuum in the mouth
take in, also metaphorically
draw something in by or as if by a vacuum
provide sexual gratification through oral stimulation
be inadequate or objectionable
attract by using an inexorable force, inducement, etc.