Yes, broadsides is a Scrabble word!

Verb

1. Collide with the broad side of

Noun

1. An advertisement (usually printed on a page or in a leaflet) intended for wide distribution

2. A speech of violent denunciation

3. All of the armament that is fired from one side of a warship

4. The whole side of a vessel from stem to stern

5. The simultaneous firing of all the armament on one side of a warship