There are 11 words that start with 'bys'.
| bys | byssi | byssal |
| byssus | byssuses | bystreet |
| bystander | bystreets | byssinoses |
| byssinosis | bystanders | |
Note: These 11 words that start with 'bys' are found from the USA & Canada version of the tournament Scrabble word list.