Flood

Flood /flʌd/ 洪水
例句：
It was the worst flood since records began.

这是有记录以来最严重的水灾。

flood 还有淹没的意思
例句：

We had to make a detour around the flooded fields.

我们只得绕道避开被洪水淹没的田野。

Mudslide

Mudslide / mʌdslaɪd/ 泥石流
mud 泥土slide 滑动；滑坡
例句：
He lost his house in the mudslide last week.

上周的泥石流夺走了他的房子。

Tsunami

Tsunami /tsʊ nɑmi/ 海啸 例句：
The tsunami has cost$ 20 million in lost revenues.

海啸造成的收入损失达到2000万美元。