sun's rays vs sunbeam

sun's rays

sunbeam

noun
  • Any hummingbird of the genus Aglaeactis. 

  • A visible, narrow, and intense (relative to ambient light) ray of sunlight. 

  • Synonym of sunshine (“ironic form of address to an inferior or troublemaker”) 

  • Any of various lycaenid butterflies of the genus Curetis. 

How often have the words sun's rays and sunbeam occurred in a corpus of books? (source: Google Ngram Viewer )