loafer vs tennis shoe

loafer

noun
  • A shoe with no laces, resembling a moccasin. 

  • An idle person. 

  • A wolf, especially a grey or timber wolf. 

verb
  • To loaf around; to be idle. 

tennis shoe

noun
  • A specialty sports shoe designed for playing tennis. 

  • A sneaker (trainer). 

How often have the words loafer and tennis shoe occurred in a corpus of books? (source: Google Ngram Viewer )