Stiftail or Stifftail: How To spell?

The word Stiftail is misspelled against Stifftail, a noun meaning "The ruddy duck."

Stifftail has double "ff" is mispronounced as "f"
Remember double 'FF' in between the strings Sti & tail which should not be misspelled with single 'F'
Wrong Spelling: Sti-f-tail
Correct Spelling: Sti-ff-tail
Find more wrongly spelled words of Stifftail to spell it well.