unafraid vs brave

unafraid is not a noun while brave is a noun.

Word	Noun	Adjective	Verb	Adverb
unafraid	No	Yes	No	No
brave	Yes	Yes	Yes	No

unafraid (noun)	brave (noun)
	people who are brave
	a North American Indian warrior

unafraid (adjective)	brave (adjective)
oblivious of dangers or perils or calmly resolute in facing them	possessing or displaying courage; able to face and deal with danger or fear without flinching
free from fear or doubt; easy in mind	invulnerable to fear or intimidation
	brightly colored and showy

unafraid (verb)	brave (verb)
	face and withstand with courage