There are 9 13-letter words that end with 'pping'.
| bootstrapping | eavesdropping | 
| horsewhipping | mousetrapping | 
| intercropping | sharecropping | 
| stairstepping | transshipping | 
| underpropping | |
Note: These 9 13-letter words that end with 'pping' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words end with apping, ipping, opping, epping, upping, ypping.
6-letter words end with 'pping' (1)