The word 热水 (rè shuǐ) is formed through a straightforward semantic combination of two independent, meaningful characters: 热, which conveys the concept of "hot" or "heat", and 水, which represents the concept of "water". By placing these two concrete ideas side-by-side, they fuse into a single, compound concept that directly and transparently denotes "hot water", where the first element descriptively modifies the second to specify a particular type of water.