courageous vs desperate

courageous is not a noun while desperate is a noun.

Word	Noun	Adjective	Verb	Adverb
courageous	No	Yes	No	No
desperate	Yes	Yes	No	No

courageous (noun)	desperate (noun)
	a person who is frightened and in need of help

courageous (adjective)	desperate (adjective)
possessing or displaying courage; able to face and deal with danger or fear without flinching	showing extreme courage; especially of actions courageously undertaken in desperation as a last resort
	fraught with extreme danger; nearly hopeless
	arising from or marked by despair or loss of hope
	showing extreme urgency or intensity especially because of great need or desire
	desperately determined
	(of persons) dangerously reckless or violent as from urgency or despair