Confused about depression terminology

Hi!

English is not my native language, so I hope someone can help me explain something.

When a person is suffering "mild depression", is he/she suffering "mild major depression"? What is the difference between "major depression" and just "depression"?

What is the difference between "mild depression" and "minor depression"?

When taking depression tests, I usually end up with "no depression", still I feel there is a lot of room for feeling fairly bad without getting a score in the depression range. Is this because you may have a minor depression that isn't rated as "mild major depression"?

Sorry, I'm just a bit confused..

Thanks in advance

There's a massive difference. Mild depression is more of having blue days when your mood is low. Severe depression is a whole other ball game, its where catatonic features come in, where suicidal ideation becomes very very present, where one can barely get out of bed some days, if not all days, where there is completely no hope for the future, just a bleak endless nothing.

Hope this gives a somewhat clearer idea of the difference.