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