A hum that rises with road speed and changes when you swerve. Usually a bearing, not a tire.
A worn wheel bearing. If the pitch changes in a lane change, that is the classic sign.
Do not wait long. A failed bearing can lock a wheel. Have it confirmed this week.
Reading about sounds only goes so far. The tuner on our home page listens in your browser and tells you what it hears. The app goes further: it names the exact fault, checks it against your vehicle, and tells you how urgent it is.