Yes, declared is a Scrabble word!

Adjective

1. Made known or openly avowed

2. Declared as fact; explicitly stated

Verb

1. State emphatically and authoritatively

2. Announce publicly or officially

3. State firmly

4. Declare to be

5. Authorize payments of

6. Designate (a trump suit or no-trump) with the final bid of a hand

7. Make a declaration (of dutiable goods) to a customs official

8. Proclaim one's support, sympathy, or opinion for or against