There are 18 words that end with 'ucking'.
| bucking | ducking | 
| lucking | mucking | 
| fucking | rucking | 
| sucking | tucking | 
| yucking | chucking | 
| clucking | plucking | 
| shucking | trucking | 
| untucking | upchucking | 
| bloodsucking | motherfucking | 
Note: These 18 words that end with 'ucking' are found from the USA & Canada version of the tournament Scrabble word list.