zany |ˈzeɪnɪ| — a buffoon in one of the old comedies; imitates others for ludicrous effect

zap |zæp| — a sudden event that imparts energy or excitement, usually with a dramatic impact

zareba  — Alternative spelling of zariba, particularly in figurative contexts

zariba |zəˈriːbə| — (in East Africa) A tall protective hedge, around a village or fortified camp.