tend vs wait on

tend

verb
  • To wait (upon), as attendants or servants; to serve; to attend. 

  • To be likely, or probable to do something, or to have a certain habit or leaning. 

  • To accompany as an assistant or protector; to care for the wants of; to look after; to watch; to guard. 

  • To kindle; ignite; set on fire; light; inflame; burn. 

  • To look after (e.g. an ill person.) 

  • To contribute to or toward some outcome. 

  • To manage (an anchored vessel) when the tide turns, to prevent it from entangling the cable when swinging. 

  • To make a tender of; to offer or tender. 

wait on

verb
  • To wait for (a person). 

  • To provide a service to (someone); to act as a servant to (someone); to serve (someone) as a waiter or waitress in a restaurant. 

  • To wait for (a thing, or an event to take place). 

  • To fly above its master, waiting till game is sprung. 

  • To be in store for (someone). 

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