[9rx]

Correct, but irrelevant. Suburban is a subset of urban, not the other way around — originally referring to the portion of an urban area found outside of the wall.

The physical walls aren't often found anymore, but the term still refers to an urban area that surrounds where a wall might have been placed historically.

[simoncion]

> Suburban is ... originally referring to...

Like you said, this is irrelevant. Cities aren't planned or built like that, and really haven't been... since the founding of the USA, at the very latest. (If they were, the Brits would have had a much more difficult time capturing D.C. than they did.)

[9rx]

Nice history lesson that you've written for absolutely no reason, but we still don't know what there is other than rural and urban. Pointlessly pointing out obvious things like that there can be suburbs within urban areas, like there can be hamlets in rural areas, does not answer the question or serve any purpose whatsoever.

[sgarland]

> Nice history lesson that you've written for absolutely no reason…

This you?

> …originally referring to the portion of an urban area found outside of the wall. The physical walls aren't often found anymore, but the term still refers to an urban area that surrounds where a wall might have been placed historically.