There are 333 12-letter words that start with 'di'.
Note: These 333 12-letter words that start with 'di' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with dis, dia, div, dic, dip, dig, din, dil, dim, dir, dif, die, dio, dit, did, dib, diz, dik, diu, dih, diq, diw, dix.
3-letter words start with 'di' (10)