Yes, dragon is a Scrabble word!

Noun

1. A creature of Teutonic mythology; usually represented as breathing fire and having a reptilian body and sometimes wings

2. A fiercely vigilant and unpleasant woman

3. A faint constellation twisting around the north celestial pole and lying between Ursa Major and Cepheus

4. Any of several small tropical Asian lizards capable of gliding by spreading winglike membranes on each side of the body