ex vs woman

ex and woman both are nouns.

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

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

Other hypernyms of ex include adult female.

ex (noun)	woman (noun)
the 24th letter of the Roman alphabet	women as a class
a woman who was formerly a particular man's wife	an adult female person (as opposed to a man)
a man who was formerly a certain woman's husband	a female person who plays a significant role (wife or mistress or girlfriend) in the life of a particular man

ex (adjective)	woman (adjective)
out of fashion