grow vs heighten

grow

verb
  • To become larger, to increase in magnitude. 

  • To appear or sprout. 

  • To undergo growth; to be present (somewhere) 

  • To develop, to mature. 

  • To cause or allow something to become bigger, especially to cultivate plants. 

  • To assume a condition or quality over time. 

heighten

verb
  • To advance, increase, augment, make larger, more intense, stronger etc. 

  • To make high; to raise higher; to elevate. 

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