Yes, MEZEREON is a Scrabble word!

Letter values in Scrabble US: M 3, E 1, Z 10, E 1, R 1, E 1, O 1, N 1.

Is it a valid word?

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

small European deciduous shrub with fragrant lilac-colored flowers followed by red berries on highly toxic twigs

Also: february daphne, daphne mezereum.