What does it sound like? Hum, grinding, clicking, banging, thumping. The fact that it changes with turning, definitely points towards wheel bearing.

Grab the top of each tire and shake. If there's play, double check the lug nuts, shake again. Wheel bearing. These generally hum, or grind (depending on how bad they are). You can sometimes hear a click or pop once when turning a particular direction when they settle. Sounds like metal on metal.