flamboyant vs ostentatious

flamboyant is a noun but ostentatious is not a noun.

Word	Noun	Adjective	Verb	Adverb
flamboyant	Yes	Yes	No	No
ostentatious	No	Yes	No	No

flamboyant (noun)	ostentatious (noun)
showy tropical tree or shrub native to Madagascar; widely planted in tropical regions for its immense racemes of scarlet and orange flowers; sometimes placed in genus Poinciana

flamboyant (adjective)	ostentatious (adjective)
elaborately or excessively ornamented	intended to attract notice and impress others
marked by ostentation but often tasteless	(of a display) tawdry or vulgar