queen regnant vs woman

queen regnant and woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
queen regnant	Yes	No	No	No
woman	Yes	No	No	No

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

Other hypernyms of queen regnant include female aristocrat, adult female.

queen regnant (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