nerve vs braveness

nerve and braveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
nerve	Yes	No	Yes	No
braveness	Yes	No	No	No

As nouns, braveness is a hypernym of nerve; that is, braveness is a word with a broader meaning than nerve:

nerve: the courage to carry on
braveness: a quality of spirit that enables you to face danger or pain without showing fear

Other hypernyms of nerve include bravery, courage, courageousness.

nerve (noun)	braveness (noun)
the courage to carry on	a quality of spirit that enables you to face danger or pain without showing fear
impudent aggressiveness
any bundle of nerve fibers running to various organs and tissues of the body

nerve (verb)	braveness (verb)
get ready for something difficult or unpleasant