intake vs sucking

intake and sucking both are nouns.

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

As nouns, sucking is a hyponym of intake; that is, sucking is a word with a more specific, narrower meaning than intake:

intake: the process of taking food into the body through the mouth (as by eating)
sucking: the act of sucking

Other hyponyms of intake include eating, feeding, deglutition, drink, swallow, suck, suction, drinking, imbibing, imbibition.

intake (noun)	sucking (noun)
the process of taking food into the body through the mouth (as by eating)	the act of sucking
the act of inhaling; the drawing in of air (or other gases) as in breathing
an opening through which fluid is admitted to a tube or container