challengerKK [ˈtʃæləndʒɚ] ｜ /ˈtʃæləndʒɚ/
GEPT 中高級
C1noun
a person who competes against someone else, especially in a contest or game
In the world chess championship, the grandmaster from Russia will be the challenger, facing the reigning champion.
挑戰者；競爭者