summary vs sketch

summary and sketch both are nouns.

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

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

summary (noun)	sketch (noun)
a brief statement that presents the main points in a concise form	preliminary drawing for later elaboration
	short descriptive summary (of events)
	a humorous or satirical drawing published in a newspaper or magazine
	a brief literary description

summary (adjective)	sketch (adjective)
briefly giving the gist of something
performed speedily and without formality

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