This is the 2676th most frequent Japanese word.
洪水
Flood.
The word '洪水' here is used to describe a natural disaster involving excessive water overflowing onto land.
昨日市内で大規模な洪水が発生しました。
A large flood occurred in the city yesterday.
Here, '洪水' is used in the context of an official warning regarding a possible flooding event.
洪水警報が発令されたので、避難準備をしてください。
A flood warning has been issued, so please prepare for evacuation.
In this sentence, '洪水' is figuratively expressed to describe an overwhelming amount of tasks.