There are 7 15-letter words that start with 'ref'.
| reflectometries | reflexivenesses |
| reformabilities | refortification |
| refractometries | refrangibleness |
| refundabilities | |
Note: These 7 15-letter words that start with 'ref' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with refl, refr, refu, refo, refi, refe, refa, reff, refs, reft.
4-letter words start with 'ref' (2)