Decenium or Decennium: How To spell?

The word Decenium is misspelled against Decennium, a noun meaning "A period of ten years."

Decennium has double "nn" is mispronounced as "n"
Remember double 'NN' in between the strings dece & ium which should not be misspelled with single 'N'
Wrong Spelling: dece-n-ium
Correct Spelling: dece-nn-ium
Check more misspelled words of Decennium to spell it correct.