suck vs sucking

suck and sucking both are nouns.

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

As nouns, suck and sucking are synonyms defined as:

Other synonyms of suck include suction.

suck (noun)	sucking (noun)
the act of sucking	the act of sucking

suck (verb)	sucking (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.