young lady vs miss

young lady and miss both are nouns.

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

As nouns, young lady and miss are synonyms defined as:

Other synonyms of young lady include fille, girl, missy, young woman.

young lady (noun)	miss (noun)
a young female	a failure to hit (or meet or find etc)
	a young female

young lady (verb)	miss (verb)
	leave undone or leave out
	fail to experience
	fail to reach
	feel or suffer from the lack of
	fail to reach or get to
	fail to perceive or to catch with the senses or the mind
	be without
	fail to attend an event or activity
	be absent