There are 15 10-letter words that start with 'sid'.
| sideboards | sideburned | sidechecks | 
| sidelights | sideliners | sidelining | 
| sidepieces | siderolite | sidesaddle | 
| sidestream | sidestroke | sideswiped | 
| sideswipes | sidetracks | sidewinder | 
Note: These 15 10-letter words that start with 'sid' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with side, sidl, sidd, sidh, sidi.
4-letter words start with 'sid' (2)