[wenc]

It's not a question of ontology but of convention.

Burger is a subclass of sandwich, but it's a distinct subclass that has a different name, and the superclass name is excluded.

[kragen]

Fortunately, as Wikipedia explains, most people do not share the illogical convention you are advocating, though presumably most of the people you know do.

(...please God don't let him ask me about hotdogs...)

[wenc]

I believe most restaurants menus do adhere to this convention.