Decolation or Decollation: How To spell?

The word Decolation is misspelled against Decollation, a noun meaning "A painting representing the beheading of a saint or martyr, esp. of St. John the Baptist."

Decollation has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings deco & ation which should not be misspelled with single 'L'
Wrong Spelling:  deco-l-ation 
Correct Spelling:  deco-ll-ation 
Find more incorrect spellings of Decollation to spell right way.