There are 13 words that start with 'troo'.
| troop | trooz | troops |
| trooped | trooper | troopers |
| troopial | trooping | troopials |
| troopship | troostite | troopships |
| troostites | ||
Note: These 13 words that start with 'troo' are found from the USA & Canada version of the tournament Scrabble word list.