There are 4 15-letter words that start with 'impo'.
| imponderability | importunateness |
| impossibilities | impoverishments |
Note: These 4 15-letter words that start with 'impo' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with impos, impor, impol, impon, impou, impov, impot, impow.
6-letter words start with 'impo' (4)