customer vs thief

customer

noun
  • A native official who exacted customs duties. 

  • A person, especially one engaging in some sort of interaction with others. 

  • A patron, a client; one who purchases or receives a product or service from a business or merchant, or intends to do so. 

thief

noun
  • One who steals another person's property, especially by stealth and without using force or violence. 

  • One who carries out a theft. 

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