afterword vs wrap-up

afterword

noun
  • an epilogue. 

  • an appendix. 

  • a postscript. 

wrap-up

noun
  • A concluding action; a conclusion. 

  • A brief condensation or recapitulation as a final summary, especially to a news programme. 

How often have the words afterword and wrap-up occurred in a corpus of books? (source: Google Ngram Viewer )