Ilustration or Illustration: How To spell?
The word Ilustration is misspelled against Illustration, a noun meaning "A picture designed to decorate a volume or elucidate a literary work."
Illustration has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings i & ustration which should not be misspelled with single 'L'
Wrong Spelling:  i-l-ustration  Correct Spelling:  i-ll-ustration 
Check more misspelled words of Illustration to spell it correct.