marauder vs mugger

marauder

noun
  • Someone who moves about in roving fashion looking for plunder. 

  • Any person who or thing which marauds. 

mugger

noun
  • A person who assaults and robs others, especially in a public place. 

  • A large crocodile, Crocodylus palustris, of southwest Asia, having a very broad wrinkled snout. 

  • A person who makes exaggerated faces, as a performance; a gurner. 

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