The word Twopeny is misspelled against Twopenny, an adjective meaning "the value twopence."
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Twopenny has double "nn" is mispronounced as "n"
Remember double 'NN' in between the strings twope & y which should not be misspelled with single 'N'
Wrong Spelling:  twope-n-y 
Correct Spelling:  twope-nn-y 
Find more incorrect spellings of Twopenny to spell right way.