Answer : Scientific theory.
Explanation : Once the scientist proposes a scientific hypothesis which is largely supported, then it can be tested with reproducible results for the given experiments and on obtaining reliable, accurate and precise results of the experiments it can get qualified to be called as scientific theory.
A scientific theory has to be a well-substantiated explanation of some aspect of the science which based on a scientific facts that have been repeatedly confirmed through observation and experiment. This fact-supported theories should not be "guesses" or "hypothesis" but should be very reliable, as it accounts with the real world.
