Where I live, urban means city central and suburban is the area/s around the city -- you have to go through somewhat of a commute to get from the suburbs to the urb. Suburbs tend to have fewer high-density / intensity businesses and are often called bedroom communities because they consist mainly of housing and stores that cater to people in their homes. For example, grocery, Starbucks, hardware, boutiques, theaters, Starbucks, craft stores, Starbucks, car service places, Starbucks, malls, that sort of thing.
Yes I see where you are coming from with urban and suburban. The problem where I live I suppose what shops we have would fit the term suburban but there is no city to be a suburb of that is it and outside of it is countryside.
We have small businesses (business parks - light industry plus couple of main factories but apart from that is housing and shops to serve housing).
The term we use for what you are calling bedroom communities is dormitory which many people refer to Ashford as because a lot of newcomers commute to London by train. So like you are inferring all they do is sleep in Ashford not work and often because they work long hours and long hours traveling do not really contribute or participate in community activities.