Yes, FEVERFEW is a Scrabble word!

Letter values in Scrabble US: F 4, E 1, V 4, E 1, R 1, F 4, E 1, W 4.

Is it a valid word?

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

bushy aromatic European perennial herb having clusters of buttonlike white-rayed flower heads; valued traditionally for medicinal uses; sometimes placed in genus Chrysanthemum

Also: tanacetum parthenium, chrysanthemum parthenium.