outstanding vs great

outstanding is not a noun while great is a noun.

Word	Noun	Adjective	Verb	Adverb
outstanding	No	Yes	No	No
great	Yes	Yes	No	No

As adjectives, outstanding and great are synonyms defined as:

outstanding (noun)	great (noun)
	a person who has achieved distinction and honor in some field

outstanding (adjective)	great (adjective)
having a quality that thrusts itself into attention	excellent
of major significance or importance	in an advanced stage of pregnancy
distinguished from others in excellence	uppercase
owed as a debt	remarkable or out of the ordinary in degree or magnitude or effect
	of major significance or importance
	relatively large in size or number or extent; larger than others of its kind