Difference between Administrator, Viewer, Editor rights from End User Perspective who doesn't have Designer Access

Hi All ,
It's a very common but very tricky question which I am not able to resolved.
Let's say I have 3 Users who are using any Appian Application.
They are added in 3 different groups as mentioned below:

User 1 : Added in Group A having  Administrator rights.
User 2 : Added in Group B having Viewer rights.
User 3 : Added in Group C having Editor rights.

All these users doesn't have any Designer rights i.e. they are not added in Appian Designer group.

So , What would be the difference between the role of these 3 Users.
I am not able to get the difference between Administrator, Viewer, Editor rights from End User Perspective who doesn't have Designer Access

If there are any differences , Please list down all .

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