Sixtenth or Sixteenth: How To spell?
The word Sixtenth is misspelled against Sixteenth, a noun meaning "An interval comprising two octaves and a second."
Sixteenth has double "ee" is mispronounced as "e"Remember double 'EE' in between the strings Sixt & nth which should not be misspelled with single 'E'
Wrong Spelling:  Sixt-e-nth  Correct Spelling:  Sixt-ee-nth 
Find more wrongly spelled words of Sixteenth to spell it well.