grab bag vs separation

grab bag

noun
  • A moderately large bag of crisps or other snack, intended for sharing. 

  • A gift, purchase, etc. whose contents are concealed until after a selection is made. 

  • A bag containing essential items, which can be easily picked up and taken in an emergency. 

  • Any random assortment, selection or possibility. 

separation

noun
  • Departure from active duty, while not necessarily leaving the service entirely. 

  • An agreement legalizing such an arrangement. 

  • An object that separates two spaces. 

  • The act of disuniting two or more things, or the condition of being separated. 

  • The act or condition of two or more people being separated from one another. 

  • The place at which a division occurs. 

  • An interval, gap or space that separates things or people. 

  • The act or condition of a married couple living in separate homes while remaining legally married. 

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