There are 11 15-letter words that start with 'rem'.
| remanufacturers | remanufacturing | 
| rematerializing | remediabilities | 
| rememberability | remobilizations | 
| remonetizations | remonstratively | 
| remorselessness | removablenesses | 
| remythologizing | |
Note: These 11 15-letter words that start with 'rem' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with remo, rema, remi, reme, remu, remy, remn, rems.
4-letter words start with 'rem' (1)