雨水 (yǔ shuǐ) means “rainwater” | MotiTan Chinese Dictionary

More examples

小区的绿地用雨水灌溉，减少了自来水的使用。xiǎo qū de lǜ dì yòng yú shuǐ guàn gài jián shǎo le zì lái shuǐ de shǐ yòng

The green spaces in the residential community are irrigated with rainwater, reducing the use of tap water.

The collected water that remains when rainfall has reached surfaces, hollows, buckets, or other containers.

雨yǔ: Drops of water that fall from the sky.
水shuǐ: The clear liquid used for drinking, washing, and other needs.

降雨后留存在地表或人工容器中的水，强调由雨形成的可见水体。jiàng yǔ hòu liú cún zài dì biǎo huò rén gōng róng qì zhōng de shuǐ qiáng diào yóu yǔ xíng chéng de kě jiàn shuí tǐ

The compound 雨 (yǔ, "rain") + 水 (shuǐ, "water") directly identifies water by the natural event that supplies it.

In everyday conversation, 雨水 (yǔshuǐ, "rainwater") often occurs with verbs for collecting, storing, draining, or reusing water, especially in household and gardening contexts.