addition vs lacuna

addition

noun
  • Anything that is added. 

  • The act of adding anything. 

  • The arithmetic operation of adding. 

  • A dot at the right side of a note as an indication that its sound is to be lengthened one half. 

  • A title annexed to a person's name to identify him or her more precisely. 

  • Something added to a coat of arms, as a mark of honour. 

lacuna

noun
  • Any gap, break, hole, or lack in a set of things; something missing. 

  • A language gap, which occurs when there is no direct translation in the target language for a lexical term found in the source language. 

  • An absent part, especially in a book or other piece of writing, often referring to an ancient manuscript or similar. 

  • A space visible between cells, allowing free passage of light. 

  • A small blank space; a gap or vacancy; a hiatus. 

  • A small opening; a small pit or depression, especially in bone. 

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