Yes, REDBUDS is a Scrabble word!

Letter values in Scrabble US: R 1, E 1, D 2, B 3, U 1, D 2, S 1.

Is it a valid word?

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

small shrubby tree of eastern North America similar to the Judas tree having usually pink flowers; found in damp sheltered underwood

Also: cercis canadensis.