alighten vs coruscate

alighten

verb
  • To make light; to illuminate or brighten. 

  • To lighten; to reduce in weight or heaviness. 

  • To alight, to dismount or get down from. 

  • To alight; to land, to descend and rest. 

coruscate

verb
  • To give off light; to reflect in flashes; to sparkle. 

  • To exhibit brilliant technique or style. 

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