There are 13 words that start with 'roto'.
| roto | rotor | rotos |
| rotors | rototill | rototills |
| rotorcraft | rototilled | rototiller |
| rotogravure | rototillers | rototilling |
| rotogravures | ||
Note: These 13 words that start with 'roto' are found from the USA & Canada version of the tournament Scrabble word list.