mutation vs short form

mutation

noun
  • An alteration a particular sound of a word, especially the initial consonant, which is triggered by the word's morphological or syntactic context and not by its phonological context. 

  • A group of thrushes. 

  • Any alteration or change. 

  • A mutant. 

  • Any heritable change of the base-pair sequence of genetic material. 

short form

noun
  • A word with the same meaning as another formed by removing one or more of the syllables of the longer word, and considered a word in its own right rather than an abbreviation. 

  • Particularly in Slavic languages, a shortened form of the adjective, used predicatively. 

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