There are 9 13-letter words that start with 'reg'.
| regardfulness | regenerations |
| regimentation | regionalistic |
| regionalizing | registrations |
| regretfulness | regurgitating |
| regurgitation | |
Note: These 9 13-letter words that start with 'reg' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with regr, regi, rega, regu, rege, regl, rego, regn, regg, regm, regs.
4-letter words start with 'reg' (1)