vista vs tableau

vista and tableau both are nouns.

Word	Noun	Adjective	Verb	Adverb
vista	Yes	No	No	No
tableau	Yes	No	No	No

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

Other hyponyms of vista include background, ground, coast, exposure, foreground, glimpse, middle distance, side view.

vista (noun)	tableau (noun)
the visual percept of a region	any dramatic scene
	a group of people attractively arranged (as if in a painting)