five o'clock shadow vs sideburns

five o'clock shadow

noun
  • A beard growth visible late in the day on the face of a man with facial hair growth that was clean-shaven in the morning. 

sideburns

noun
  • Facial hair reaching from the top of the head down the side of the face to the side of the chin. 

How often have the words five o'clock shadow and sideburns occurred in a corpus of books? (source: Google Ngram Viewer )