Sounds like a wheel bearing. A shop can easily tell you if it is bad and what side is bad. They should put it on a lift and with the car in drive listen to the bearings. You can do a quick test by driving the car about 25 mph and turn left and right (like weaving in and out of traffic). do this on a back road with no other cars and good visibility of on-coming traffic. If you here it more when turning right = left front wheel bearing, left = right front. If it is in the rear it may be harder to tell this way. Should be ok to drive short distances but get it fixed SOON.