description vs sketch

description and sketch both are nouns.

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

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

description (noun)	sketch (noun)
sort or variety	preliminary drawing for later elaboration
the act of describing something	short descriptive summary (of events)
a statement that represents something in words	a humorous or satirical drawing published in a newspaper or magazine
	a brief literary description

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