lactation vs activity

lactation and activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
lactation	Yes	No	No	No
activity	Yes	No	No	No

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

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

lactation (noun)	activity (noun)
feeding an infant by giving suck at the breast	any specific behavior
the production and secretion of milk by the mammary glands	the trait of being active; moving or acting rapidly and energetically
the period following birth during which milk is secreted	an organic process that takes place in the body
	a process existing in or produced by nature (rather than by the intent of human beings)
	the state of being active
	(chemistry) the capacity of a substance to take part in a chemical reaction