挑戦【ちょうせん】
challenge, defiance, dare, attempt, try
挑む【いどむ】
to challenge to (a fight, game, etc.), to throw down the gauntlet, to contend for, to tackle (e.g. a problem), to attempt, to go after (a prize, record, etc.), to pressure (someone) for sex, to make advances to
挑戦者【ちょうせんしゃ】
challenger
挑発【ちょうはつ】
provocation, stirring up, arousal, excitement, stimulation
挑発的【ちょうはつてき】
provocative, incendiary, inflammatory, suggestive, lascivious, risqué