There are 15 words that start with 'robot'.
| robot | robots | 
| robotic | robotry | 
| robotics | robotism | 
| robotize | robotisms | 
| robotized | robotizes | 
| robotries | robotizing | 
| robotically | robotization | 
| robotizations | |
Note: These 15 words that start with 'robot' are found from the USA & Canada version of the tournament Scrabble word list.