Arbitres or Arbitress: How To spell?
The word Arbitres is misspelled against Arbitress, a noun meaning "A female arbiter; an arbitratrix."
Arbitress has double 'ss' in the end mispronounced as 's'Remember double 'SS' appears in the end of this word which should not be misspelled with single 'S'
Wrong Spelling:  arbitre-s  Correct Spelling:  arbitre-ss 
Find more wrongly spelled words of Arbitress to spell it well.