Milenniarism or Millenniarism: How To spell?
The word Milenniarism is misspelled against Millenniarism, a noun meaning "Belief in, or expectation of, the millennium; millenarianism."
Millenniarism has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings mi & enniarism which should not be misspelled with single 'L'
Wrong Spelling:  mi-l-enniarism  Correct Spelling:  mi-ll-enniarism 
Find more wrongly spelled words of Millenniarism to spell it well.