There are 12 words that start with 'ectop'.
| ectopia | ectopic | 
| ectopias | ectoplasm | 
| ectoproct | ectoplasms | 
| ectoprocts | ectopically | 
| ectoplasmic | ectoparasite | 
| ectoparasites | ectoparasitic | 
Note: These 12 words that start with 'ectop' are found from the USA & Canada version of the tournament Scrabble word list.