There are 5 13-letter words that start with 'impa'.
| impalpability | impassability |
| impassibility | impassiveness |
| impassivities | |
Note: These 5 13-letter words that start with 'impa' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with impas, impar, impal, impac, impai, impan, impat, impaw, impav.
6-letter words start with 'impa' (7)