regio

As a noun location

is a particular point or place in physical space.

As an adjective regio is

regal, royal.

As a proper noun district

is (with determiner|informal) the district of columbia, the federal district of the united states.

As an adjective regio is

regal, royal.

As a proper noun city

is (uk) a popular shortened form of the city of london, the historic core of london where the roman settlement of londinium was established.

As an adjective regio is

regal, royal.

As an adjective regio

is regal, royal.

As a verb place is

.

As a noun territory

is a large extent or tract of land; a region; a country; a district.

As an adjective regio is

regal, royal.

As a noun region

is region; area.

As an adjective regio is

regal, royal.

As nouns the difference between rego and regio

is that rego is registration for a motor vehicle while regio is a term used in planetary geology large areas of a planet or moon that are strongly differentiated in colour or albedo.