Equestriene or Equestrienne: How To spell?
The word Equestriene is misspelled against Equestrienne, a noun meaning "A woman skilled in equestrianism; a horsewoman."
Equestrienne has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings equestrie & e which should not be misspelled with single 'N'
Wrong Spelling:  equestrie-n-e  Correct Spelling:  equestrie-nn-e 
Check more misspelled words of Equestrienne to spell it correct.