There are 14 words that start with 'sia'.
| sial | sials | sialic |
| sialid | sialids | sialoid |
| siamang | siamese | sialidan |
| siamangs | siameses | sialidans |
| sialagogue | sialagogues | |
Note: These 14 words that start with 'sia' are found from the USA & Canada version of the tournament Scrabble word list.