There are 8 words that start with 'plet'.
| plethora | plethoras |
| plethoric | plethysmogram |
| plethysmograms | plethysmograph |
| plethysmographs | plethysmography |
Note: These 8 words that start with 'plet' are found from the USA & Canada version of the tournament Scrabble word list.