look after vs wait on

look after

verb
  • To have as one's business; to manage, be responsible for. 

  • To follow with the eyes; to look in the direction of (someone or something departing). 

  • To care for; to keep safe. 

  • To seek out, to look for. 

wait on

verb
  • 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 person). 

  • 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 look after and wait on occurred in a corpus of books? (source: Google Ngram Viewer )