boot boy vs knave

boot boy

noun
  • One of a gang of violent hooligans who usually wear short-cropped hair and bovver boots. 

  • A boy who cleans boots and shoes. 

  • A boy who cares for a footballer's boots. 

knave

noun
  • A playing card marked with the figure of a servant or soldier; a jack. 

  • A tricky, deceitful fellow; a dishonest person. 

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