Peniform or Penniform: How To spell?
The word Peniform is misspelled against Penniform, an adjective meaning "Having the form of a feather or plume."
Penniform has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings pe & iform which should not be misspelled with single 'N'
Wrong Spelling:  pe-n-iform  Correct Spelling:  pe-nn-iform 
Find more incorrect spellings of Penniform to spell right way.