surtitle vs supertitle

surtitle and supertitle both are nouns.

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

As nouns, surtitle and supertitle are synonyms defined as:

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

surtitle (noun)	supertitle (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