The scenario is I'm talking about a particular thing. You are talking about the precise same thing. We are arguing about it because we don't realize that we are talking about the same thing.
Basically, using different words to talk about the same thing. But, we don't understand each other. There is a single word that describes this scenario. I can't remember it.
Best Answer
When a person realises that two parties are arguing (even though they are really agreed on the matter under discussion) merely because they're using different terminology, the comment
is often made.
This hinges on the sense given by AHD:
and is short for