adumbrate vs outline

adumbrate is not a noun while outline is a noun.

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

As verbs, adumbrate and outline are synonyms defined as:

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

Other synonyms of adumbrate include sketch.

adumbrate (noun)	outline (noun)
	a schematic or preliminary plan
	a sketchy summary of the main points of an argument or theory
	the line that appears to bound an object

adumbrate (verb)	outline (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	trace the shape of
	draw up an outline or sketch for something