afternoon tea vs snack food

afternoon tea

noun
  • A small meal or snack eaten between lunch and dinner (supper); a period of time set aside for this purpose, taken as a break from work or from a conference. 

  • A formal afternoon meal comprising light snacks, accompanied by tea. 

snack food

noun
  • A food traditionally or commonly consumed as a snack between meals. 

  • Any other food consumed as a snack. 

How often have the words afternoon tea and snack food occurred in a corpus of books? (source: Google Ngram Viewer )