feeding vs lactation

feeding and lactation both are nouns.

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

As nouns, lactation is a hyponym of feeding; that is, lactation is a word with a more specific, narrower meaning than feeding:

feeding (noun)	lactation (noun)
the act of consuming food	feeding an infant by giving suck at the breast
the act of supplying food and nourishment	the production and secretion of milk by the mammary glands
	the period following birth during which milk is secreted