unnie vs woman

unnie and woman both are nouns.

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

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

unnie: a female who is older than the speaker, especially used by Korean female
woman: an adult female person (as opposed to a man)

Other hypernyms of unnie include adult female.

unnie (noun)	woman (noun)
a female who is older than the speaker, especially used by Korean female	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