[Ahban]

General Relativity is a Theory that INCLUDES gravity. It attempts to explain gravity in a larger context. The smaller issue of how gravity works is a Law.

GR has been well-confirmed for several decades now and is generally believed to be true- but that is not long enough to promote it to a law. For example a geocentric model of the universe was confirmed by every prediction and observation for 1400 years- but it was wrong. It turned out another model, the heliocentric model, also explained the data.

[Dimensio]

The smaller issue of how gravity works is a Law.

Really now? Why don't you use the Law of Gravity, as you know it, to explain how gravity works.

[RadioAstronomer]

GR has been well-confirmed for several decades now and is generally believed to be true- but that is not long enough to promote it to a law.

A theory never becomes a law.