There are 10 words that start with 'imperm'.
| impermanent | impermeable |
| impermanence | impermanency |
| impermanences | impermanently |
| impermissible | impermissibly |
| impermanencies | impermeability |
Note: These 10 words that start with 'imperm' are found from the USA & Canada version of the tournament Scrabble word list.