Athyism or Atheism: How To spell?

The word Athyism is misspelled against Atheism, meaning "The denial of the existence of God."

Word contains consecutive vowels 'EI' in between alphabets ath & sm is misspelled as 'YI'
Wrong Spelling:  ath-yi-sm 
Correct Spelling:  ath-ei-sm 
Find more wrongly spelled words of Atheism to spell it well.