communicate vs propagate

communicate

verb
  • To impart or transmit (information or knowledge) to someone; to make known, to tell. 

  • To pass on (a disease) to another person, animal etc. 

  • To express or convey ideas, either through verbal or nonverbal means; to have intercourse, to exchange information. 

  • To receive the bread and wine at a celebration of the Eucharist; to take part in Holy Communion. 

  • To administer the Holy Communion to (someone). 

  • To be connected with (another room, vessel etc.) by means of an opening or channel. 

  • To impart or transmit (an intangible quantity, substance); to give a share of. 

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. 

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