Humming sound coming from front of car (control arm?)

[DPK99]

There is a lower pitch humming sound from the front of my car. I think it's probably control arm related because it is noticably louder when I turn the steering wheel. The strange thing is the sound almost goes away after driving for about 20 minutes, but if I listen closely it's still there, but hyst not as loud.

I have been told that I will eventually need to get the lower right front control arm replaced as well as both radius bushings. What's the more likely culprit here? Also, radius bushings and sway arm bushings the same thing?

Thanks.