birthday suit vs emptiness

birthday suit

noun
  • Nakedness, unclothed skin; an exposure of a human's natural anatomy without clothing. 

  • Used other than figuratively or idiomatically: see birthday, suit. 

emptiness

noun
  • A nonexistence; a lack of existence. 

  • The state or feeling of being empty. 

  • A void; a nothingness; something lacking existence. 

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