ingestion vs suction

ingestion and suction both are nouns.

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

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

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

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

ingestion (noun)	suction (noun)
the process of taking food into the body through the mouth (as by eating)	the act of sucking
	a force over an area produced by a pressure difference

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