suction vs suck

suction and suck both are nouns.

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

As nouns, suction and suck are synonyms defined as:

Other synonyms of suction include sucking.

suction (noun)	suck (noun)
the act of sucking	the act of sucking
a force over an area produced by a pressure difference

suction (verb)	suck (verb)
empty or clean (a body cavity) by the force of suction	give suck to
remove or draw away by the force of suction	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.