Ang bushings is usually the rubbers that are in between the metal parts of the underchasis or the underchasis parts like your shock absorbers. It sometimes look like a rubber donut or a rubber washer. Pagworn-out na ito, meron kang maririnig na "tok" or "tag" na sound or a metal-to-metal contact sound. Lalo na kung nasa lubak ka. Some worn out rubber bushings sa front could cause "misbehaviour" in steering.
Ang shocks na sira naman would show some "oil-leak" sa tube ng shocks (if oil filled). Or when you push down the side of the car where that shock is located mabagal ito mag-spring back up or mag"bounce" effect sa spring back.