Bilion or Billion: How To spell?
The word Bilion is misspelled against Billion, a noun meaning "According to the French and American method of numeration, a thousand millions, or 1,000,000,000; according to the English method, a million millions, or 1,000,000,000,000. See Numeration."
Billion has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings bi & ion which should not be misspelled with single 'L'
Wrong Spelling:  bi-l-ion  Correct Spelling:  bi-ll-ion 
Find more incorrect spellings of Billion to spell right way.