"water dispenser" is a perfectly correct and usable part of speech in written English.
For example, "The office break room has a water dispenser to refill your water bottle."
"A water dispenser – filters the water.
But first I make a beeline for the hot water dispenser.
There are no cups for the water dispenser, but it is probably just as well.
The last great innovation was the addition of a chilled water dispenser on the refrigerator.
An inlaid brass bucket designed as a bath accessory in the Near East became a holy water dispenser in Venice.
"We haven't got a water dispenser or hot water in the showers, and our housing is, well, pretty basic.
To get around these inconveniences, Wayne Conrad has patented a portable water dispenser that collects moisture from the air.
In museums, parks, mosques - even along every length of street - there's usually a public refrigerated water dispenser, an Iranian version of a drinking fountain.
Samsung and SodaStream have announced the first-ever four-door (FOUR?!) refrigerator with a sparkling water dispenser as well as the now standard ice one.
In the courtyard, a water dispenser was placed next to stinking toilets, and a broken washing machine lay by a trash can and a few brooms.
Among features that the company says are a first for the category are a hands-free water dispenser in the exterior of the door that senses when a glass or pitcher is filled and stops, a water and ice filtration system that removes pharmaceuticals sometimes found in drinking water, and a hot water dispenser for tea or oatmeal.
