rendering vs surtitle

rendering and surtitle both are nouns.

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

As nouns, surtitle is a hyponym of rendering; that is, surtitle is a word with a more specific, narrower meaning than rendering:

rendering: a written communication in a second language having the same meaning as the written communication in a first language
surtitle: translation of the words of a foreign opera (or choral work) projected on a screen above the stage

Other hyponyms of rendering include mistranslation, crib, pony, trot, retroversion, caption, subtitle, supertitle.

rendering (noun)	surtitle (noun)
giving in acknowledgment of obligation	translation of the words of a foreign opera (or choral work) projected on a screen above the stage
the act of interpreting something as expressed in an artistic performance
perspective drawing of an architect's design
a coat of stucco applied to a masonry wall
an explanation of something that is not immediately obvious
a performance of a musical composition or a dramatic role etc.
a written communication in a second language having the same meaning as the written communication in a first language