There are 15 words that start with 'rero'.
| reroll | reroof | rerose | 
| rerolls | reroofs | reroute | 
| rerolled | reroller | reroofed | 
| rerouted | reroutes | rerollers | 
| rerolling | reroofing | rerouting | 
Note: These 15 words that start with 'rero' are found from the USA & Canada version of the tournament Scrabble word list.