initialism vs uncial

initialism

noun
  • The process of forming words or terms using initial letters of other words. 

  • A term formed from the initial letters of several words or parts of words, which is itself pronounced letter by letter. 

uncial

noun
  • A style of writing using uncial letters. 

  • A letter in this style. 

  • A manuscript in this style. 

adj
  • Of or relating to a majuscule style of writing with unjoined, rounded letters, originally used in the 4th–9th centuries. 

  • Of or relating to an ounce, or an inch, especially to letters printed an inch high. 

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