lady friend vs girl

lady friend and girl both are nouns.

Word	Noun	Adjective	Verb	Adverb
lady friend	Yes	No	No	No
girl	Yes	No	No	No

As nouns, lady friend and girl are synonyms defined as:

lady friend and girl: a girl or young woman with whom a man is romantically involved

Other synonyms of lady friend include girlfriend.

lady friend (noun)	girl (noun)
a girl or young woman with whom a man is romantically involved	a young female
	a girl or young woman with whom a man is romantically involved
	a youthful female person
	a friendly informal reference to a grown woman
	a female human offspring