There are 13 words that start with 'subser'.
| subsere | subseres | 
| subserve | subseries | 
| subserved | subserves | 
| subserving | subservient | 
| subservience | subserviency | 
| subserviences | subserviently | 
| subserviencies | |
Note: These 13 words that start with 'subser' are found from the USA & Canada version of the tournament Scrabble word list.