overhauling vs refurb

overhauling

noun

  • The act by which something is overhauled. 

refurb

noun

  • The act of refurbishing 

  • a thing that has been refurbished 

verb

  • to refurbish 

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