retain vs send

retain

verb
  • To keep in one's pay or service. 

  • To employ by paying a retainer. 

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

  • To keep in possession or use. 

  • To hold secure. 

send

verb
  • To dispatch an agent or messenger to convey a message or do an errand. 

  • To care. 

  • To make a successful ascent of a sport climbing route. 

  • To excite, delight, or thrill (someone). 

  • To pitch. 

  • To bring to a certain condition. 

  • To cause to be or to happen; to bring, bring about; (archaic) to visit: (Referring to blessing or reward) To bestow; to grant. (Referring to curse or punishment) To inflict. Sometimes followed by a dependent proposition. 

  • To make something (such as an object or message) go from one place to another (or to someone). 

noun
  • An operation in which data is transmitted. 

  • An icon (usually on a computer screen and labeled with the word "Send") on which one clicks (with a mouse or its equivalent) or taps to transmit an email or other electronic message. 

  • A messenger, especially one sent to fetch the bride. 

  • A callout or diss usually aimed at a specific person, often in the form of a diss track. 

  • A successful ascent of a sport climbing route. 

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