noun, noun which may take the genitive case particle 'no'
warm water
Refers to water that is warm, not hot. Commonly used in contexts like heating, bathing, or swimming pools.
温水プールで泳ぐのが好きです。
I like swimming in a heated pool.
温水と冷水を混ぜて適温にする。
Mix warm water and cold water to get the right temperature.