mother's milk vs milk

mother's milk and milk both are nouns.

Word	Noun	Adjective	Verb	Adverb
mother's milk	Yes	No	No	No
milk	Yes	No	Yes	No

As nouns, milk is a hypernym of mother's milk; that is, milk is a word with a broader meaning than mother's milk:

mother's milk (noun)	milk (noun)
milk secreted by a woman who has recently given birth	produced by mammary glands of female mammals for feeding their young
	a white nutritious liquid secreted by mammals and used as food by human beings
	any of several nutritive milklike liquids

mother's milk (verb)	milk (verb)
	take milk from female mammals
	add milk to
	exploit as much as possible