Ilusion or Illusion: How To spell?
The word Ilusion is misspelled against Illusion, a noun meaning "A plain, delicate lace, usually of silk, used for veils, scarfs, dresses, etc."
Illusion has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings i & usion which should not be misspelled with single 'L'
Wrong Spelling:  i-l-usion  Correct Spelling:  i-ll-usion 
Check more misspelled words of Illusion to spell it correct.