There are 12 words that end with 'masts'.
masts | demasts | dismasts |
durmasts | topmasts | mainmasts |
foremasts | beechmasts | mizenmasts |
neuromasts | royalmasts | mizzenmasts |
Note: These 12 words that end with 'masts' are found from the USA & Canada version of the tournament Scrabble word list.