gains vs returns

gains

noun
  • Increase in muscle mass. 

returns

noun
  • The return of the soldiers fit for duty. 

  • The rendering back of a writ to the proper officer. 

  • Merchandise returned to the retailer, wholesaler or supplier. 

  • A mild, light-coloured kind of tobacco. 

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