bravado vs ostentation

bravado and ostentation both are nouns.

Word	Noun	Adjective	Verb	Adverb
bravado	Yes	No	No	No
ostentation	Yes	No	No	No

As nouns, ostentation is a hypernym of bravado; that is, ostentation is a word with a broader meaning than bravado:

Other hypernyms of bravado include fanfare, flash.

bravado (noun)	ostentation (noun)
a swaggering show of courage	pretentious or showy or vulgar display
	lack of elegance as a consequence of being pompous and puffed up with vanity
	a gaudy outward display