reformulate vs reuse

reformulate

verb
  • To formulate again or differently. 

reuse

verb
  • To use again, or in another place. 

  • To use again something that is considered past its usefulness (usually for something else). 

noun
  • The act of salvaging or in some manner restoring a discarded item to yield something usable. 

  • The act of using again, or in another place. 

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