Nouns

(n)flourisha showy gesture“she entered with a great flourish”
(n)flourishan ornamental embellishment in writing
(n)flourisha display of ornamental speech or language
(n)flourish, brandishthe act of waving
(n)flourish, fanfare, tucket(music) a short lively tune played on brass instruments“he entered to a flourish of trumpets”, “her arrival was greeted with a rousing fanfare”

Verbs

(v)boom, thrive, flourish, expandgrow vigorously“The deer population in this town is thriving”, “business is booming”
(v)thrive, prosper, fly high, flourishmake steady progress; be at the high point in one's career or reach a high point in historical significance or importance“The new student is thriving”
(v)brandish, flourish, wavemove or swing back and forth“She waved her gun”