Trepaner or Trepanner: How To spell?
The word Trepaner is misspelled against Trepanner, a noun meaning "One who trepans."
Trepanner has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings trepa & er which should not be misspelled with single 'N'
Wrong Spelling:  trepa-n-er  Correct Spelling:  trepa-nn-er 
Explore spell check of Trepanner to spell without errors.