Subdistrict vs. Suburb — What's the Difference?

A subdistrict or sub-district is an administrative division that is generally smaller than a district.

A suburb (or suburban area or suburbia) is a mixed-use or residential area, existing either as part of a city/urban area, or as a separate residential community within commuting distance of one. Suburbs might have their own political or legal jurisdiction, especially in the United States, but this is not always the case, especially in the United Kingdom where most suburbs are located within the administrative boundaries of cities.

A district forming part of a larger district.

An outlying district of a city, especially a residential one

(transitive) To divide (a district) into subdistricts.

A usually residential area or community outlying a city.

Suburbs The usually residential region around a major city; the environs.

A residential area located on the outskirts of a city or large town that usually includes businesses that cater to its residents; such as schools, grocery stores, shopping centers, restaurants, convenience stores, etc.

(by extension) The outer part; the environment.

Any subdivision of a conurbation, not necessarily on the periphery.

An outlying part of a city or town; a smaller place immediately adjacent to a city; in the plural, the region which is on the confines of any city or large town; as, a house stands in the suburbs; a garden situated in the suburbs of Paris.

Hence, the confines; the outer part; the environment.

A residential district located on the outskirts of a city