Coferwork or Cofferwork: How To spell?
The word Coferwork is misspelled against Cofferwork, a noun meaning "Rubblework faced with stone."
Cofferwork has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings Co & erwork which should not be misspelled with single 'F'
Wrong Spelling:  Co-f-erwork  Correct Spelling:  Co-ff-erwork 
Find more incorrect spellings of Cofferwork to spell right way.