affix vs appendix

affix

noun
  • That which is affixed; an appendage. 

  • Any small feature, as a figure, a flower, or the like, added for ornament to a vessel or other utensil, to an architectural feature. 

  • A bound morpheme added to the word’s stem's end. 

  • A bound morpheme added to a word’s stem; a prefix, suffix, etc. 

  • The complex number a+bi associated with the point in the Gauss plane with coordinates (a,b). 

verb
  • To subjoin, annex, or add at the close or end; to append to. 

  • To attach. 

  • To fix or fasten figuratively; with on or upon. 

appendix

noun
  • The vermiform appendix. 

  • A text added to the end of a book or an article, containing additional information. 

  • Any process, prolongation, or projection. 

How often have the words affix and appendix occurred in a corpus of books? (source: Google Ngram Viewer )