Pinigrade or Pinnigrade: How To spell?

The word Pinigrade is misspelled against Pinnigrade, a noun meaning "An animal of the seal tribe, moving by short feet that serve as paddles."

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

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