It is my contention that the word hamburger should no longer exist.
The term "hamburger" originates from the German city of Hamburg, and was coined in the late 19th century. Eventually, the "burger" part became a suffix, used in new terms such as cheeseburger, turkeyburger, veggieburger, or any other type of burger. This made the original hamburger inaccurate, because it is not made from ham. Hamburgers, then, should be called beefburgers.
I refuse to call a beefburger anything other than beefburger. And I would hope that everyone else adopt the same policy.