spark up vs spice up

spark up

verb
  • to make more exotic or fun 

  • To provide electrification. 

  • To initiate (a conversation, debate etc.) 

  • to rekindle 

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

spice up

verb
  • To make more exotic, fun or extravagant. 

  • To enhance the flavor of something by adding spice to it. 

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