flourish vs grandiosity

flourish and grandiosity both are nouns.

Word	Noun	Adjective	Verb	Adverb
flourish	Yes	No	Yes	No
grandiosity	Yes	No	No	No

As nouns, grandiosity is a hypernym of flourish; that is, grandiosity is a word with a broader meaning than flourish:

Other hypernyms of flourish include grandiloquence, magniloquence, ornateness, rhetoric.

flourish (noun)	grandiosity (noun)
the act of waving	high-flown style; excessive use of verbal ornamentation
a display of ornamental speech or language
a showy gesture
(music) a short lively tune played on brass instruments
an ornamental embellishment in writing

flourish (verb)	grandiosity (verb)
grow vigorously
move or swing back and forth
make steady progress; be at the high point in one's career or reach a high point in historical significance or importance