refurbish vs retread

refurbish

verb
  • To rebuild or replenish with all new material; to restore to original (or better) working order and appearance. 

retread

verb
  • To replace the traction-providing surface of a vehicle that employs tires, tracks or treads. 

  • To renew the tread of a tyre, providing a cheaper alternative to buying a new tyre, but potentially introducing a risk of premature failure if performed improperly. 

  • To tread again, to walk along again, to follow a path again. 

noun
  • A person who re-entered military service in World War II after serving in World War I. 

  • A return over ground previously covered; a retraversal or repetition. 

  • A used tire whose surface, the tread, has been replaced to extend its life and use. 

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