vignette vs sketch

vignette and sketch both are nouns.

Word	Noun	Adjective	Verb	Adverb
vignette	Yes	No	No	No
sketch	Yes	No	Yes	No

As nouns, sketch is a hypernym of vignette; that is, sketch is a word with a broader meaning than vignette:

vignette: a small illustrative sketch (as sometimes placed at the beginning of chapters in books)
sketch: preliminary drawing for later elaboration

Other hypernyms of vignette include study.

As nouns, vignette and sketch are synonyms defined as:

vignette (noun)	sketch (noun)
a small illustrative sketch (as sometimes placed at the beginning of chapters in books)	preliminary drawing for later elaboration
a photograph whose edges shade off gradually	short descriptive summary (of events)
a brief literary description	a humorous or satirical drawing published in a newspaper or magazine
	a brief literary description

vignette (verb)	sketch (verb)
	describe roughly or briefly or give the main points or summary of
	make a sketch of