brilliance vs grey matter

brilliance

noun
  • The quality of having extraordinary mental capacity. 

  • The quality of being exceptionally effulgent (giving off light). 

  • Magnificence; resplendence. 

grey matter

noun
  • Brains; a person's ability to think. 

  • A collection of cell bodies and (usually) dendritic connections, in contrast to white matter. 

  • Literal brains as a general substance. 

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