glower vs pharos

glower

noun
  • That which glows or emits light. 

  • An angry glare or stare. 

verb
  • To look or stare with anger. 

pharos

noun
  • That which stands out; a shining light. 

  • An ancient lighthouse or beacon to guide sailors. 

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