masquerade ball vs masked ball

masquerade ball and masked ball both are nouns.

Word	Noun	Adjective	Verb	Adverb
masquerade ball	Yes	No	No	No
masked ball	Yes	No	No	No

As nouns, masquerade ball and masked ball are synonyms defined as:

masquerade ball and masked ball: a ball at which guests wear costumes and masks

Other synonyms of masquerade ball include fancy-dress ball.

masquerade ball (noun)	masked ball (noun)
a ball at which guests wear costumes and masks	a ball at which guests wear costumes and masks