There are 9 15-letter words that start with 'retr'.
| retransmissions | retroactivities |
| retrogradations | retrogressively |
| retroperitoneal | retroreflection |
| retroreflective | retroreflectors |
| retrospectively | |
Note: These 9 15-letter words that start with 'retr' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with retro, retra, retri, retre, retry.
5-letter words start with 'retr' (2)