There are 15 words that start with 'seme'.
| seme | semen | semes | 
| sememe | semens | sememes | 
| sememic | semester | semeiotic | 
| semesters | semestral | semeiology | 
| semeiotics | semestrial | semeiologies | 
Note: These 15 words that start with 'seme' are found from the USA & Canada version of the tournament Scrabble word list.