There are 16 words that start with 'flagel'.
| flagella | flagellar |
| flagellin | flagellum |
| flagellant | flagellate |
| flagellins | flagellums |
| flagellants | flagellated |
| flagellates | flagellating |
| flagellation | flagellantism |
| flagellations | flagellantisms |
Note: These 16 words that start with 'flagel' are found from the USA & Canada version of the tournament Scrabble word list.