proponent vs supporter

proponent

noun
  • One who supports something; an advocate 

  • One who makes a proposal or proposition. 

  • One who propounds a will for probate. 

adj
  • Making proposals; proposing. 

supporter

noun
  • A person who supports, promotes, advocates or champions a cause, movement, or political party; an adherent. 

  • A person who provides moral or physical support to another; an attendant participating in a ceremony or procession. 

  • Someone who is a fan of a certain sports team or sportsperson. 

  • A garter worn around the leg to support a sock or stocking. 

  • Something that supports a structure such as a building or a sculpture. 

  • An animal or figure that supports a shield in a coat of arms. 

  • Something that supports another thing. 

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