contest + -ant

source: Photo and video evidence has emerged after sexual assault allegations were raised against "Son Goku", the champion of the 23rd World Martial Arts Tournament: - Album on Imgur

a person who takes part in a contest or competition.

(競技会･コンテストなどへの)出場者, 参加者, 競争者

mid 17th century: from French, present participle of contester, from Latin contestari ‘call upon to witness’ (see contest).