There are 12 words that end with 'cysts'.
cysts | encysts | oocysts |
otocysts | cholecysts | macrocysts |
sporocysts | statocysts | blastocysts |
heterocysts | nematocysts | trichocysts |
Note: These 12 words that end with 'cysts' are found from the USA & Canada version of the tournament Scrabble word list.