If a burger isn't beef is it still a burger?

When I think of a burger, I think of a ground beef patty in a bun with cheese, salad etc. However you can get pork patties, lamb patties, chicken patties, even vegetable patties etc. But are these actual burgers or something else?
If a burger isnt beef is it still a burger?
Only beef is a burger
Any ground meat in a patty shape is a burger
Anything in a bun is a burger
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If a burger isn't beef is it still a burger?
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