client vs visitor

client

noun
  • A customer, a buyer or receiver of goods or services. 

  • The role of a computer application or system that requests and/or consumes the services provided by another having the role of server. 

  • A person who receives help or services from a professional such as a lawyer or accountant. 

  • A person who employs or retains an attorney to represent him or her in any legal matter, or one who merely divulges confidential matters to an attorney while pursuing professional assistance without subsequently retaining the attorney. 

visitor

noun
  • Someone who pays a visit to a specific place or event; a sightseer or tourist. 

  • An object which lands or passes by Earth or its orbit. 

  • A head or overseer of an institution such as a college (in which case, equivalent to the university's chancellor) or cathedral or hospital, who resolves disputes, gives ceremonial speeches, etc. 

  • A person authorized to visit an institution to see that it is being managed properly. 

  • An extraterrestrial being on Earth for any reason. 

  • The object in the visitor pattern that performs an operation on the elements of a structure one by one. 

  • Someone, or a team, that is playing away from home. 

  • Someone who visits someone else; someone staying as a guest. 

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