simplify vs streamline

simplify

verb
  • To make simpler, either by reducing in complexity, reducing to component parts, or making easier to understand. 

  • To become simpler. 

streamline

verb
  • To simplify or organize a process in order to increase its efficiency. 

  • To design and construct the contours of a vehicle etc. so as to offer the least resistance to its flow through a fluid. 

  • To modernise. 

noun
  • On a weather chart, a line that is tangent to the flow of the wind. 

  • A line that is tangent to the velocity of flow of a fluid; equivalent to the path of a specific particle in that flow. 

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