illuminate vs spark up

illuminate

verb
  • To glow; to light up. 

  • To be exposed to light. 

  • To shine light on something. 

  • To decorate the page of a manuscript book with ornamental designs. 

  • To decorate something with lights. 

  • To clarify or make something understandable. 

  • To make spectacular. 

  • To direct a radar beam toward. 

noun
  • Someone thought to have an unusual degree of enlightenment. 

spark up

verb
  • To light up; light a cigarette or start smoking a pipe, bong, etc. 

  • To provide electrification. 

  • To initiate (a conversation, debate etc.) 

  • to make more exotic or fun 

  • to rekindle 

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