+1 for frankfurter and wiener, because those are regional synonyms for basically the same type of sausage. of course it might have some local adjustments, but you know what to expect. https://en.wikipedia.org/wiki/Vienna_sausage

but brat? a Bratwurst is a very different kind of sausage. thicker, different meat, different taste, different preparation, different taste. frankfurter / wienerli, are commonly boiled in water, bratwurst go on a grill. (Brat = braten = roast).

i got a western-european POV. maybe USians use these words differently. which means they're wrong. or wronger than europeans are when arguing what stuff should be called. doughnut / berliner / krapfen / [insert name you use], just to trigger some people.