customer vs human

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. 

human

noun
  • The tallest, most abundant and most intelligent of primates; Homo sapiens. 

  • Any hominid of the genus Homo. 

adj
  • Of or belonging to the species Homo sapiens or its closest relatives. 

  • Having the nature or attributes of a human being. 

verb
  • To behave as or become, or to cause to behave as or become, a human. 

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