propagate vs sow

propagate

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

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

  • 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 generate; to produce. 

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

sow

verb
  • To spread abroad; to propagate. 

  • To scatter over; to besprinkle. 

  • To scatter, disperse, or plant (seeds). 

noun
  • A mass of metal solidified in a mold. 

  • A sowbug. 

  • A female bear, she-bear. 

  • A contemptible, often fat woman. 

  • A female guinea pig. 

  • A channel that conducts molten metal to molds. 

  • A kind of covered shed, formerly used by besiegers in filling up and passing the ditch of a besieged place, sapping and mining the wall, etc. 

  • A female pig. 

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