ingestion vs swallow

ingestion and swallow both are nouns.

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

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

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

ingestion (noun)	swallow (noun)
the process of taking food into the body through the mouth (as by eating)	the act of swallowing
	small long-winged songbird noted for swift graceful flight and the regularity of its migrations
	a small amount of liquid food

ingestion (verb)	swallow (verb)
	believe or accept without questioning or challenge
	keep from expressing
	tolerate or accommodate oneself to
	take back what one has said
	utter unclearly
	engulf and destroy
	pass through the esophagus as part of eating or drinking
	enclose or envelop completely, as if by swallowing