There are 19 12-letter words that start with 'sca'.
Note: These 19 12-letter words that start with 'sca' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with scar, scal, scan, scat, scab, scap, scam, scau, scav, scaf, scag, scad.
4-letter words start with 'sca' (7)