Because doctor and nurse are constructed as opposites.
It's like saying the blue red - it's possible to have a bluish red, compared to an orangish red, and the opposite of blue is orange, and the opposite of red is green (color wheel! whee!!), but blue and red are constructed as opposites, and it sounds weird to say, "I prefer the blue red."
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It's like saying the blue red - it's possible to have a bluish red, compared to an orangish red, and the opposite of blue is orange, and the opposite of red is green (color wheel! whee!!), but blue and red are constructed as opposites, and it sounds weird to say, "I prefer the blue red."
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