overlook vs pick up on

overlook

verb
  • To fail to notice; to look over and beyond (anything) without seeing it. 

  • To offer a view (of something) from a higher position. 

  • To pretend not to have noticed (something, especially a mistake or flaw); to pass over (something) without censure or punishment. 

noun
  • A vista or point that gives a beautiful view. 

pick up on

verb
  • To notice, observe, learn, or understand, especially something otherwise overlooked. 

  • To adopt a practice in which others already engage. 

  • To continue or build upon (for example, a task, analysis, or narrative), beginning from a point at which someone has previously stopped. 

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