Wheel bearing / hub
Lets the wheel spin smoothly on the axle.
Signs it's worn: Growl or hum that gets louder with speed or in turns.
What's wrong with my car? · Wheels
Humming or growling that gets louder with speed?
Usually: Wheel bearing.
A hum or growl that rises with speed, and changes when you steer left or right, is the classic worn wheel bearing.
The parts that fix it
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This is a first read from the symptom, not a diagnosis of your car. If you're not sure, have a mechanic confirm before you buy, and bring the prices you found here with you.