Fily or Filly: How To spell?
The word Fily is misspelled against Filly, a noun meaning "A female foal or colt; a young mare. Cf. Colt, Foal."
Filly has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings fi & y which should not be misspelled with single 'L'
Wrong Spelling:  fi-l-y  Correct Spelling:  fi-ll-y 
Find more wrongly spelled words of Filly to spell it well.