Yes, BLADDERWORT is a Scrabble word!

Letter values in Scrabble US: B 3, L 1, A 1, D 2, D 2, E 1, R 1, W 4, O 1, R 1, T 1.

Is it a valid word?

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

any of numerous aquatic carnivorous plants of the genus Utricularia some of whose leaves are modified as small urn-shaped bladders that trap minute aquatic animals