dame vs young lady

dame and young lady both are nouns.

Word	Noun	Adjective	Verb	Adverb
dame	Yes	No	No	No
young lady	Yes	No	No	No

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

Other hypernyms of dame include fille, girl, miss, missy, young woman.

dame (noun)	young lady (noun)
informal terms for a (young) woman	a young female
a woman of refinement