CONTESTANT

Definition:

[noun] a person who participates in competitions
[noun] a person who dissents from some established policy
Synonyms: dissenter, dissident, protester, objector

Related Words:

agonist
athlete, jock
defaulter
entrant
long shot
loser, also-ran
opposition, opponent, opposite
outsider
player, participant
pothunter
qualifier
rival, challenger, competitor, competition, contender
starter
winner, victor
withdrawer
conscientious objector, CO
nonconformist, recusant
political dissident
NIMBY