caller
/ˈkɔːlə(r)/noun
1
- a person who pays a brief visit or makes a telephone call短暂访问者; 打电话者。
2
- a person who calls out numbers in a game of bingo or directions in a dance宾戈游戏的开号者; 喊出舞步的指挥。
2.1
- Austral./NZ a racing or sports commentator〈澳/新西兰〉比赛（或运动）讲解员。