Dithysm or Ditheism: How To spell?

The word Dithysm is misspelled against Ditheism, a noun meaning "The doctrine of those who maintain the existence of two gods or of two original principles (as in Manicheism), one good and one evil; dualism."

Word contains consecutive vowels 'EI' in between alphabets dith & sm is misspelled as 'Y'
Wrong Spelling:  dith-y-sm 
Correct Spelling:  dith-ei-sm 
Find more wrongly spelled words of Ditheism to spell it well.