Sounds like it might be the tie-rod end, or worn bushings on the control arm or perhaps the ball joint is suspect.
Jack the suspect side up and grab the wheel at 9 and 3 oclock. push/pull? any movement? there shouldn't be. if there is it could be control arm bushings, etc.
Grab the wheel at 12 and 6, and push/pull. any movement indicates a failed/failing wheel bearing.