Pinigrada or Pinnigrada: How To spell?

The word Pinigrada is misspelled against Pinnigrada, a noun meaning "Same as Pinnipedia."

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