Pinipedia or Pinnipedia: How To spell?
The word Pinipedia is misspelled against Pinnipedia, a noun meaning "A suborder of aquatic carnivorous mammals including the seals and walruses; -- opposed to Fissipedia."
Pinnipedia has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings pi & ipedia which should not be misspelled with single 'N'
Wrong Spelling:  pi-n-ipedia  Correct Spelling:  pi-nn-ipedia 
Find more wrongly spelled words of Pinnipedia to spell it well.