There is no technical and specific difference between a scientific law and a theory, but in general something described as "a scientific law" is subject to less scrutiny and proof than something described as "a scientific theory." A scientific law is an idea that we say "let's assume this is true because it seems simple and universal enough." A theory is an idea that we say "this is the explanation that the evidence supports."
Gravity is an excellent example. For the longest time Newton's explanation of gravity was accepted as scientific law. In the last 100 years, however, general relativity has provided a much better explanation, proving the "law" wrong.
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