Octosylable or Octosyllable: How To spell?
The word Octosylable is misspelled against Octosyllable, a noun meaning "A word of eight syllables."
Octosyllable has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings octosy & able which should not be misspelled with single 'L'
Wrong Spelling:  octosy-l-able  Correct Spelling:  octosy-ll-able 
Find more incorrect spellings of Octosyllable to spell right way.