Millionaire or Millionnaire: How To spell?
The word Millionaire is misspelled against Millionnaire, a noun meaning "Millionaire."
Millionnaire has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings millio & aire which should not be misspelled with single 'N'
Wrong Spelling:  millio-n-aire  Correct Spelling:  millio-nn-aire 
Find more incorrect spellings of Millionnaire to spell right way.