outstanding vs spectacular

outstanding is not a noun while spectacular is a noun.

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

As adjectives, outstanding and spectacular are synonyms defined as:

outstanding and spectacular: having a quality that thrusts itself into attention

Other synonyms of outstanding include prominent, salient, striking.

outstanding (noun)	spectacular (noun)
	a lavishly produced performance

outstanding (adjective)	spectacular (adjective)
having a quality that thrusts itself into attention	having a quality that thrusts itself into attention
of major significance or importance	characteristic of spectacles or drama
distinguished from others in excellence	sensational in appearance or thrilling in effect
owed as a debt