There are 9 words that start with 'luteo'.
| luteous | luteolin | 
| luteolins | luteotropic | 
| luteotropin | luteotrophic | 
| luteotrophin | luteotropins | 
| luteotrophins | |
Note: These 9 words that start with 'luteo' are found from the USA & Canada version of the tournament Scrabble word list.