intake vs suction

intake and suction both are nouns.

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

As nouns, suction is a hyponym of intake; that is, suction 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)
suction: the act of sucking

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

intake (noun)	suction (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	a force over an area produced by a pressure difference
an opening through which fluid is admitted to a tube or container

intake (verb)	suction (verb)
	empty or clean (a body cavity) by the force of suction
	remove or draw away by the force of suction