There are 7 11-letter words that end with 'ack'.
| biofeedback | diamondback | crackerjack |
| leatherback | quarterback | steeplejack |
| stickleback | ||
Note: These 7 11-letter words that end with 'ack' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with back, rack, jack, pack, lack, tack, sack, hack, nack, wack, iack, mack, yack, uack.
4-letter words end with 'ack' (11)