Diferentia or Differentia: How To spell?
The word Diferentia is misspelled against Differentia, meaning "Any essential characteristic of a species by reason of which it differs from other species."
Differentia has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings Di & erentia which should not be misspelled with single 'F'
Wrong Spelling:  Di-f-erentia  Correct Spelling:  Di-ff-erentia 
Find more wrongly spelled words of Differentia to spell it well.