There are 27 11-letter words that end with 'ition'.
Note: These 27 11-letter words that end with 'ition' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with sition, dition, nition, tition, rition, bition, lition, uition, oition.
7-letter words end with 'ition' (3)