There are 19 words that start with 'regro'.
| regrow | regroom | regroup | 
| regrown | regrows | regrooms | 
| regroove | reground | regroups | 
| regrowth | regroomed | regrooved | 
| regrooves | regrouped | regrowing | 
| regrowths | regrooming | regrooving | 
| regrouping | ||
Note: These 19 words that start with 'regro' are found from the USA & Canada version of the tournament Scrabble word list.