ingestion vs drink

ingestion and drink both are nouns.

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

As nouns, drink is a hyponym of ingestion; that is, drink 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)
drink: the act of swallowing

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

ingestion (noun)	drink (noun)
the process of taking food into the body through the mouth (as by eating)	the act of drinking alcoholic beverages to excess
	the act of swallowing
	any liquid suitable for drinking
	a single serving of a beverage
	any large deep body of water

ingestion (verb)	drink (verb)
	be fascinated or spell-bound by; pay close attention to
	take in liquids
	consume alcohol
	drink excessive amounts of alcohol; be an alcoholic
	propose a toast to