Not sure if this is a silly question, but since we know that there exists plenty of viable information to support the theory of evolution, why is it still only considered a theory? Why isn't it a law? Or called something else? Theory implies a set of ideas that is supposing something to be true. Think we're past the idea phase of the theory of evolution, no?
My understanding is that a theory consists of much more parts than a law. A law is usually something quite elementary in nature that is universal. The difference is like in math between "quadratic formula" and "trigonometry". The law of thermodynamics is a very closed, small, well defined part. It's not a theory. It's a fundamental construct of nature. A screw, bolt, joist, that all things depends upon. While theory, like theory of gravity, theory of quantum mechanics, theory of economics, or theory of evolution, even if they're true, they consist of many different parts, concepts, facts, and even laws. Theory of evolution consists math and equations of many kinds. It involved chemistry, biology, physics, geology, and many other fields of science, so it's no just a single little thing you can put a stamp on and decide "that's it, now we're done, it's finished." It's a work in progress, so it makes sense that it's a theory. Or put it this way. A law is more like a page in a book, while a theory is a whole book. A scientific theory is more, much more than a law in this sense.
With that being said, the fact that evolutionary process (or progressive improvement through randomization and selection) has been suggested by some scientists to be a law, a law of nature. The process of change that leads to better "fitness" isn't unique to biological evolution, but has been used successfully in many different software and engineering projects. (However, it also has failed many times.)