Bill vs Bob

Bill

name
  • A diminutive of the male given name William. 

  • A nickname for the British constabulary. Often called "The Bill" or "Old Bill" 

  • A surname. 

Bob

name
  • A diminutive of the male given name Robert. 

  • The person or system receiving a message or signal from a source conventionally known as Alice. 

noun
  • A generic male person. 

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