Ninyhammer or Ninnyhammer: How To spell?
The word Ninyhammer is misspelled against Ninnyhammer, a noun meaning "A simpleton; a silly person."
Ninnyhammer has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings ni & yhammer which should not be misspelled with single 'N'
Wrong Spelling:  ni-n-yhammer  Correct Spelling:  ni-nn-yhammer 
Find more wrongly spelled words of Ninnyhammer to spell it well.