Sevententh or Seventeenth: How To spell?

The word Sevententh is misspelled against Seventeenth, a noun meaning "An interval of two octaves and a third."

Seventeenth has double "ee" is mispronounced as "e"
Remember double 'EE' in between the strings Sevent & nth which should not be misspelled with single 'E'
Wrong Spelling:  Sevent-e-nth 
Correct Spelling:  Sevent-ee-nth 
Explore spell check of Seventeenth to spell without errors.

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