There are 14 10-letter words that start with 'exte'.
| extemporal | extendable | extendedly | 
| extendible | extensible | extensions | 
| extenuated | extenuates | extenuator | 
| exteriorly | extermined | extermines | 
| externally | externship | |
Note: These 14 10-letter words that start with 'exte' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with exter, exten, extem.
6-letter words start with 'exte' (3)