convoy vs shepherd

convoy

verb
  • To travel under convoy. 

  • To escort a group of vehicles, and provide protection. 

noun
  • The act of convoying; protection. 

  • A group of vehicles travelling together for safety, especially one with an escort. 

  • One or more merchant ships sailing in company to the same general destination under the protection of naval vessels. 

shepherd

verb
  • To watch over; to guide. 

  • To obstruct an opponent from getting to the ball, either when a teammate has it or is going for it, or if the ball is about to bounce through the goal or out of bounds. 

noun
  • A person who tends sheep, especially a grazing flock. 

  • Someone who watches over, looks after, or guides somebody. 

  • A swain; a rustic male lover. 

  • The pastor of a church; one who guides others in religion. 

  • A male sheep tender 

  • A German Shepherd. 

  • A male pastor 

  • A male watcher/guardian/guider/leader 

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