Yes, FORSYTHIAS is a Scrabble word!

Letter values in Scrabble US: F 4, O 1, R 1, S 1, Y 4, T 1, H 4, I 1, A 1, S 1.

Is it a valid word?

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

any of various early blooming oleaceous shrubs of the genus Forsythia; native to eastern Asia and southern Europe but widely cultivated for their branches of bright yellow bell-shaped flowers