WAG vs aperçu

WAG

noun
  • A wife or girlfriend of a sports star or other celebrity, originally and especially of an association football player. 

  • A wild-assed guess; a rough estimate. 

aperçu

noun
  • A clever insight. 

  • A summary or outline; words that summarize. 

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