Octenial or Octennial: How To spell?

The word Octenial is misspelled against Octennial, an adjective meaning "Happening every eighth year; also, lasting a period of eight years."

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