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Answers in order of panels: I'm not entirely sure about that, the wheel, dark is an adjective so it doesn't have a speed, phonetic is spelled the way it sounds, it's a Greek word so they used the letter Phi for the "f" sound, which is the same as our "ph", I can't think of another word for synonym other than "same", and lastly: no I have not.
Speed of darkness is the speed of light being removed from an area, so it's the same as the speed of light.