shortening vs telescoping

shortening

noun
  • Fat that is solid at room temperature, such as margarine or lard (not usually used of butter), used to make shortcrust pastry. 

telescoping

noun
  • The act of extending or contracting in the manner of a telescope. 

  • A telescopic action. 

  • Extending limited data to make up for gaps 

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