version vs caption

version and caption both are nouns.

Word	Noun	Adjective	Verb	Adverb
version	Yes	No	No	No
caption	Yes	No	Yes	No

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

version: a written communication in a second language having the same meaning as the written communication in a first language
caption: translation of foreign dialogue of a movie or TV program; usually displayed at the bottom of the screen

Other hyponyms of version include mistranslation, crib, pony, trot, retroversion, subtitle, supertitle, surtitle.

version (noun)	caption (noun)
manual turning of a fetus in the uterus (usually to aid delivery)	brief description accompanying an illustration
a mental representation of the meaning or significance of something	translation of foreign dialogue of a movie or TV program; usually displayed at the bottom of the screen
something a little different from others of the same type	taking exception; especially a quibble based on a captious argument
a written communication in a second language having the same meaning as the written communication in a first language
an interpretation of a matter from a particular viewpoint
a written work (as a novel) that has been recast in a new form

version (verb)	caption (verb)
	provide with a caption, as of a photograph or a drawing