adumbrate vs sketch

adumbrate is not a noun while sketch is a noun.

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

As verbs, adumbrate and sketch are synonyms defined as:

adumbrate and sketch: describe roughly or briefly or give the main points or summary of

Other synonyms of adumbrate include outline.

adumbrate (noun)	sketch (noun)
	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

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