Im sure brakes and the dust shield has been checked?
Is the noise related to vehicle speed? Does it get louder the faster you go? Front wheel bearings can be tight, and still make the noise....take the vehicle out on the road......get to about 30-40 mph.....now SAFELY, on a straightaway, turn the steering wheel slightly left and then slightly right, if the noise increases or stays the same in one direction, but reduces or goes away in the other direction, it sounds like a front wheel bearing....