supertitle vs surtitle

supertitle and surtitle both are nouns.

Word	Noun	Adjective	Verb	Adverb
supertitle	Yes	No	No	No
surtitle	Yes	No	No	No

As nouns, supertitle and surtitle are synonyms defined as:

supertitle and surtitle: translation of the words of a foreign opera (or choral work) projected on a screen above the stage

supertitle (noun)	surtitle (noun)
translation of the words of a foreign opera (or choral work) projected on a screen above the stage	translation of the words of a foreign opera (or choral work) projected on a screen above the stage