ingestion vs imbibition

ingestion and imbibition both are nouns.

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

As nouns, imbibition is a hyponym of ingestion; that is, imbibition 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)
imbibition: the act of consuming liquids

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

ingestion (noun)	imbibition (noun)
the process of taking food into the body through the mouth (as by eating)	the act of consuming liquids
	(chemistry) the absorption of a liquid by a solid or gel