扉のない出入り口って英語でなんて言うの？

The entrance to anywhere is usually defined by the place in which it is built. For example, if it is an arch in the perimeter wall of a house, it would be called, the 'garden entrance,' or 'estate entrance' if it is a large property. If the arch forms part of a building, it would be the 'builing entrance.' It may also be called 'a gate' of course - even though there is not actually a physical gate across the entrance, For example, the famous Brandenberg Gate in Berlin has no physical gate (although it marks where there once was a city gate).

Unless the entrance has a gate, we would use only 'entrance'. If there is an arch over the entrance we say 'archway'. We also use 'pathway' for a path leading to an entrance. You do find arches in homes but as they aren't very big or wide, we would normally just say arch.

An entrance is where you enter a place/building to start your journey this is a general term and can have a gate/arch/door it is still the same word used If it has an arch then we simply call this an 'archway' this descrbes the shape and design of the entrance

The most common name for an arch-like entrance that does not open or close is called an Archway or an "entrance.

"Archway" - This is something that is typically outside, and in the form of a half-circle. Many people will refer to some canyon archways as an archway. And, in many cases, an archway can be seen with bridges that also have that curve in them. "Doorway." - A doorway is the side panelling of where a door should go. It does not need to have a door to be called a doorway, as many people will say, "she stood infront of the doorway."

The entrance of any building has differing designs, some have doors wheres others are openings free of closure.

If there is no door then it is not really a door, gate etc. You could call this an archway or doorway. By adding 'way' onto the end it shows that it is a way through but there is no door as a barrier. You could also use the term 'passageway' but this is more likely used to describe the passage from one end of a building to the other, for example. You could also simply say entrance (or exit, if you are leaving).