propagate vs reap

propagate

verb
  • To generate; to produce. 

  • To cause to take effect on all relevant devices in a network. 

  • To spread from person to person; to extend the knowledge of; to originate and spread; to carry from place to place; to disseminate. 

  • To produce young; to be produced or multiplied by generation, or by new shoots or plants. 

  • To cause to spread to extend; to impel or continue forward in space. 

  • To cause to continue or multiply by generation, or successive production. 

  • To take effect on all relevant devices in a network. 

reap

verb
  • To gather (e.g. a harvest) by cutting. 

  • To terminate a child process that has previously exited, thereby removing it from the process table. 

  • To obtain or receive as a reward, in a good or a bad sense. 

  • To cut (for example a grain) with a sickle, scythe, or reaping machine 

noun
  • A bundle of grain; a handful of grain laid down by the reaper as it is cut. 

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