lactation vs bodily function

lactation and bodily function both are nouns.

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

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

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

lactation (noun)	bodily function (noun)
feeding an infant by giving suck at the breast	an organic process that takes place in the body
the production and secretion of milk by the mammary glands
the period following birth during which milk is secreted