Yes, RATITE is a Scrabble word!

Letter values in Scrabble US: R 1, A 1, T 1, I 1, T 1, E 1.

Is it a valid word?

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

flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches; cassowaries; emus; moas; rheas; kiwis; elephant birds

Also: ratite bird, flightless bird.