Do what the mechanic will do: Jack up the right rear tire off the ground. Apply jack stand for safety. Do not put any part of your body under the car without jack stand in place. Do not rely on the jack alone.
With parking brake off, spin the tire and listen for sounds like grinding, or rough feeling. That is wheel bearing. But it is often silent until there is speed, heat or heavy load so you may not hear a bad bearing. Bearing is usually a whining groaning din sound, not an occasional clunk. An automotive stethoscope applied to the wheel hub near the bearing will make hearing bad bearing very easy.
Try to wiggle the tire right and left, with hands at 3 and 9. Listen and feel for movement, clicks, thumps, sounds.
Repeat the wiggle up and down, hands at 12 and 6. This will reveal clunking due to suspension wear, like rubber bushings. A very bad wheel bearing will wobble here also, but it would have to be really bad.
Optional: remove the wheel and visually inspect everything. Age will cause dry rot on the rubber bushings. The twisting moment applied to the axle when you turn will make the worn rubber parts clunk. Also, jiggle the antirollbar up and down to check the end links for movement.
Good luck
