comma vs lacuna

comma

noun
  • A brief interval. 

  • A difference in the calculation of nearly identical intervals by different ways. 

  • In Ancient Greek rhetoric, a short clause, something less than a colon, originally denoted by comma marks. In antiquity it was defined as a combination of words having no more than eight syllables in all. It was later applied to longer phrases, e.g. the Johannine comma. 

  • The punctuation mark ⟨,⟩ used to indicate a set of parts of a sentence or between elements of a list. 

  • A similar-looking subscript diacritical mark. 

  • Any of various nymphalid butterflies of the genus Polygonia, having a comma-shaped white mark on the underwings, especially Polygonia c-album and Polygonia c-aureum of North Africa, Europe, and Asia. 

  • A delimiting marker between items in a genetic sequence. 

verb
  • To place a comma or commas within text; to follow, precede, or surround a portion of text with commas. 

lacuna

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

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

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