There are 19 12-letter words that start with 'sch'.
Note: These 19 12-letter words that start with 'sch' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with scho, schi, schm, sche, schl, schn, schu, scha, schw, schr, scht, schv.
5-letter words start with 'sch' (4)