Yes, CATBIRD is a Scrabble word!

Letter values in Scrabble US: C 3, A 1, T 1, B 3, I 1, R 1, D 2.

Is it a valid word?

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

any of various birds of the Australian region whose males build ornamented structures resembling bowers in order to attract females
North American songbird whose call resembles a cat's mewing

Also: grey catbird, gray catbird, dumetella carolinensis.