Monothayst or Monotheist: How To spell?

The word Monothayst is misspelled against Monotheist, a noun meaning "One who believes that there is but one God."

Word contains consecutive vowels 'EI' in between alphabets monoth & st is misspelled as 'AY'
Wrong Spelling:  monoth-ay-st 
Correct Spelling:  monoth-ei-st 
Find more incorrect spellings of Monotheist to spell right way.