Polymorphism, in my mind, refers to the ability for variances in behavior to occur under the hood. Perhaps the best example of this is virtual methods in C++ (or, in fact, the way all methods are invoked in Java). When you have a statement that invokes such methods, and you're doing it on a pointer of a base class type, you have one chunk of code that results in myriad different operations. A homograph, I think, is a bit different. In the case a homograph, you actually need to know what is happening and you have to read the entire sentence to figure that out. In the case of polymorphism, those differences are hidden to you, and in this particular context you are indifferent to them.
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