There are 12 words that start with 'colos'.
| colossi | colossal | colossus |
| colosseum | colostomy | colostral |
| colostrum | colossally | colosseums |
| colossuses | colostrums | colostomies |
Note: These 12 words that start with 'colos' are found from the USA & Canada version of the tournament Scrabble word list.