Yes, FLOURISHED is a Scrabble word!

Letter values in Scrabble US: F 4, L 1, O 1, U 1, R 1, I 1, S 1, H 4, E 1, D 2.

Is it a valid word?

FLOURISHED is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

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

Also: fly high.