Millenialist or Millennialist: How To spell?
The word Millenialist is misspelled against Millennialist, a noun meaning "One who believes that Christ will reign personally on earth a thousand years; a Chiliast; also, a believer in the universal prevalence of Christianity for a long period."
Millennialist has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings mille & ialist which should not be misspelled with single 'N'
Wrong Spelling:  mille-n-ialist  Correct Spelling:  mille-nn-ialist 
Find more wrongly spelled words of Millennialist to spell it well.