CONTESTANT
contestant
(noun) a person who participates in competitions
dissenter, dissident, protester, objector, contestant
(noun) a person who dissents from some established policy
Source: WordNet® 3.1
Etymology
Noun
contestant (plural contestants)
A participant in a contest; specifically, a person who plays a game, as on a TV game show.
Synonym: competitor
One who brings a legal challenge.
Coordinate term: contestee
Source: Wiktionary
Con*test"ant, n. Etym: [Cf. F. contestant.]
Definition: One who contests; an opponent; a litigant; a disputant; one who
claims that which has been awarded to another.
Source: Webster’s Unabridged Dictionary 1913 Edition