There are 13 words that start with 'semico'.
| semicoma | semicolon |
| semicomas | semicolons |
| semicolony | semicolonial |
| semicolonies | semiconductor |
| semiconscious | semicommercial |
| semiconducting | semiconductors |
| semicolonialism | |
Note: These 13 words that start with 'semico' are found from the USA & Canada version of the tournament Scrabble word list.