lady vs dame

lady and dame both are nouns.

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

As nouns, lady and dame are synonyms defined as:

Other synonyms of lady include gentlewoman, ma'am, madam.

lady (noun)	dame (noun)
a woman of refinement	informal terms for a (young) woman
a polite name for any woman	a woman of refinement