Yes, broad is a Scrabble word!

Adjective

1. Having great (or a certain) extent from one side to the other

2. Broad in scope or content

3. Not detailed or specific

4. Lacking subtlety; obvious

5. Being at a peak or culminating point

6. Very large in expanse or scope

7. (of speech) heavily and noticeably regional

8. Showing or characterized by broad-mindedness

Noun

1. Slang term for a woman