ingestion vs bodily function

ingestion and bodily function both are nouns.

Word	Noun	Adjective	Verb	Adverb
ingestion	Yes	No	No	No
bodily function	Yes	No	No	No

As nouns, bodily function is a hypernym of ingestion; that is, bodily function is a word with a broader meaning than ingestion:

ingestion: the process of taking food into the body through the mouth (as by eating)
bodily function: an organic process that takes place in the body

Other hypernyms of ingestion include activity, bodily process, body process.

ingestion (noun)	bodily function (noun)
the process of taking food into the body through the mouth (as by eating)	an organic process that takes place in the body