female monarch vs woman

female monarch and woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
female monarch	Yes	No	No	No
woman	Yes	No	No	No

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

Other hypernyms of female monarch include female aristocrat, adult female.

female monarch (noun)	woman (noun)
a female sovereign ruler	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