preserve vs put aside

preserve

verb
  • To maintain throughout; to keep intact. 

  • To save from decay by the use of some preservative substance, such as sugar or salt; to season and prepare (fruits, meat, etc.) for storage. 

  • To protect; to keep from harm or injury. 

noun
  • An activity with restricted access. 

  • A sweet spread made of any of a variety of fruits. 

  • A reservation, a nature preserve. 

put aside

verb
  • To save or keep (something) to be used at a later time. 

  • Used other than figuratively or idiomatically: see put, aside. 

  • To ignore or intentionally disregard (something), temporarily or permanently, so that more important things can occupy one's attention. 

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