Afinities or Affinities: How To spell?
The word Afinities is misspelled against Affinities, which is plural of "Affinity"
Affinities has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings A & inities which should not be misspelled with single 'F'
Wrong Spelling:  A-f-inities  Correct Spelling:  A-ff-inities 
Find more wrongly spelled words of Affinities to spell it well.