There are 19 words that start with 'keto'.
| keto | ketol | ketols | 
| ketone | ketose | ketones | 
| ketonic | ketoses | ketosis | 
| ketotic | ketogenic | ketonemia | 
| ketonuria | ketonemias | ketonurias | 
| ketogeneses | ketogenesis | ketosteroid | 
| ketosteroids | ||
Note: These 19 words that start with 'keto' are found from the USA & Canada version of the tournament Scrabble word list.