Wheel bearing is an initial thought, but diagnosing is a first person exercise.
If that's what it is, replacement is a doable job, if you obtain a few things first.
If you buy a replacement from Autozone, etc., they should 'rent' [ie, pay for, then get a refund on upon return] you a three prong puller. Center that on the spindle, and hook the prongs behind the bearing. Pry it loose by tightening the puller screw with a hefty wrench. Your best friend here is a cheater bar, find a piece of hollow tubing that'll fit over your wrench, the longer the better. I have one that's 5 feet. That'll be the difference between a few minutes of pressure and a 1/2 hour of balls-out exertion.
If you have anti-lock, take care not to damage the sensor.
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We need the kind of courage that can withstand the subtle corruption of the cynics - E.W.
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