There are 16 words that start with 'flatl'.
| flatly | flatlet | flatland |
| flatlets | flatline | flatling |
| flatlong | flatlands | flatlined |
| flatliner | flatlines | flatlings |
| flatlander | flatliners | flatlining |
| flatlanders | ||
Note: These 16 words that start with 'flatl' are found from the USA & Canada version of the tournament Scrabble word list.