There are 14 10-letter words that start with 'ther'.
| therapists | therapsids | thereabout |
| thereafter | thereunder | thermalize |
| thermidors | thermionic | thermistor |
| thermoform | thermogram | thermopile |
| thermosets | thermostat | |
Note: These 14 10-letter words that start with 'ther' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with therm, there, thera, theri, thero.
5-letter words start with 'ther' (2)