junk vs retain

junk

verb
  • To throw away. 

  • To find something for very little money (meaning derived from the term junkshop) 

noun
  • A Chinese sailing vessel. 

  • The genitalia, especially of a male. 

  • Discarded or waste material; rubbish, trash, garbage. 

  • A collection of miscellaneous items of little value. 

  • Any narcotic drug, especially heroin. 

  • Salt beef. 

  • Pieces of old cable or cordage, used for making gaskets, mats, swabs, etc., and when picked to pieces, forming oakum for filling the seams of ships. 

  • Nonsense; gibberish. 

  • Material or resources of a kind lacking commercial value. 

retain

verb
  • To hold back (a pupil) instead of allowing them to advance to the next class or year. 

  • To employ by paying a retainer. 

  • To keep in one's pay or service. 

  • To keep in possession or use. 

  • To hold secure. 

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