rosebud vs young woman

rosebud and young woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
rosebud	Yes	No	No	No
young woman	Yes	No	No	No

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

Other hypernyms of rosebud include fille, girl, miss, missy, young lady.

rosebud (noun)	young woman (noun)
(a literary reference to) a pretty young girl	a young female
the bud of a rose