There are 13 words that start with 'semil'.
| semilog | semillon |
| semillons | semilunar |
| semilethal | semiliquid |
| semilethals | semiliquids |
| semiliterate | semilustrous |
| semilegendary | semiliterates |
| semilogarithmic | |
Note: These 13 words that start with 'semil' are found from the USA & Canada version of the tournament Scrabble word list.