empty space vs nothingness

empty space

noun
  • Vacuum; a space containing nothing at all 

  • An unoccupied space where something may be stored 

  • A feeling of longing for someone or something that is gone; a sense of a thing's absence. 

  • An unoccupied area or volume. 

nothingness

noun
  • A void; an emptiness. 

  • The quality of inconsequentiality; the lack of significance. 

  • The state of nonexistence; the condition of being nothing. 

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