That is the most retarded thing I've ever heard. You are basically saying that I can name something different than what it is already called, and I've effectively made it different. And if that doesn't do it for you, consider the fact that Walker and Zombie are synonyms of one another. Definition of synonym:
1. A word having the same or nearly the same meaning as another word or other words in a language.
2. A word or an expression that serves as a figurative or symbolic substitute for another.
3. In biology, a scientific name of an organism or of a taxonomic group that has been superseded by another name at the same rank.
Walkers and Zombies are the same thing as the words are synonyms of one another. Not to mention that in the first season of The Walking Dead the 2 words were used interchangeably to describe the recently un-deceased.