There are 10 words that start with 'incog'.
| incog | incogs | 
| incognita | incognito | 
| incogitant | incognitas | 
| incognitos | incognizant | 
| incognizance | incognizances | 
Note: These 10 words that start with 'incog' are found from the USA & Canada version of the tournament Scrabble word list.