challenger

US /ˈtʃæl.ɪn.dʒɚ/
UK /ˈtʃæl.ɪn.dʒɚ/
"challenger" picture
1.

a person who competes with others in a contest or sport

:
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The reigning champion faced a strong challenger in the final round.
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She proved to be a formidable challenger in the debate.
:
competitorrivalopponentcontenderadversary
2.

a person or thing that questions or disputes something

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The new policy faced many challengers from various interest groups.
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The company's dominant position was threatened by a new market challenger.
:
criticdissenterobjectorprotesterdisputer
:
challengechallenging