A growl or whine from the pump, sometimes with coolant weeping below. The bearing is going.
A failing water pump bearing or seal.
A weeping pump fails on its own schedule, not yours. Replace it before it chooses a highway.
Reading about sounds only goes so far. The tuner on our home page listens in your browser and tells you what it hears. The app goes further: it names the exact fault, checks it against your vehicle, and tells you how urgent it is.