supporter in WordNet English dictionary

1. a person who backs a politician or a team etc.
   "all their supporters came out for the game"; "they are friends of the library"
   supporter  protagonist  champion  admirer  booster  friend 
   
2. a person who contributes to the fulfillment of a need or furtherance of an effort or purpose
   "my invaluable assistant"; "they hired additional help to finish the work"
   assistant  helper  help  supporter 
   
3. a support for the genitals worn by men engaging in strenuous exercise
   athletic supporter  supporter  suspensor  jockstrap  jock 
   
4. a band (usually elastic) worn around the leg to hold up a stocking (or around the arm to hold up a sleeve)
   garter  supporter 
   
5. someone who supports or champions something
   patron  sponsor  supporter