The solution is based on "words within words". Scout has out. Gold has go, old. Caravan has car, a, van, an. Tournament has to, tour, our, urn, name, a, am amen, me, men. If you use a scrabble dictionary I'm sure that you can find many more short words that are not in common usage. On that basis Pirate Ship has at least 14 and Philosopher's Stone at least 16.