midwife vs woman

midwife and woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
midwife	Yes	No	No	No
woman	Yes	No	No	No

As nouns, woman is a hypernym of midwife; that is, woman is a word with a broader meaning than midwife:

Other hypernyms of midwife include nurse, adult female.

midwife (noun)	woman (noun)
a woman skilled in aiding the delivery of babies	women as a class
	an adult female person (as opposed to a man)
	a female person who plays a significant role (wife or mistress or girlfriend) in the life of a particular man