There are 18 9-letter words that start with 'ster'.
| steradian | sterculia | stereoing | 
| sterigmas | sterilant | sterilely | 
| sterilise | sterility | sterilize | 
| sterlings | sternites | sternmost | 
| sternness | sternpost | sternsons | 
| sternward | sternways | steroidal | 
Note: These 18 9-letter words that start with 'ster' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with stere, stern, steri, stero, sterl, stert, stera, sterc.
5-letter words start with 'ster' (2)