chor=sing,dance,表示“歌,舞”
chaorus n 合唱(队)(chor+us表名词)
choreographer n 舞蹈动作设计者(chor+eo+graph写+er人→写舞蹈的人)
choreography n 舞蹈设计(chor+eo+graphy
choir n 合唱队(choir=chor)