Septenial or Septennial: How To spell?

The word Septenial is misspelled against Septennial, meaning "Recurring every seven years."

Septennial has double "nn" is mispronounced as "n"
Remember double 'NN' in between the strings septe & ial which should not be misspelled with single 'N'
Wrong Spelling: septe-n-ial
Correct Spelling: septe-nn-ial
Find more wrongly spelled words of Septennial to spell it well.