としん都心toshin
1.

The main area of a large city where most of the commercial, cultural, and administrative activities are concentrated, often bustling with people and businesses.

2.

The part of a major urban area that serves as a focal point for transportation, shopping, and entertainment, typically featuring tall buildings and significant infrastructure.

3.

The core region of a city that is typically characterized by its density and significance, often housing key institutions and landmarks.

Example:

彼はその商売を都心に集中した。

ふくとしん副都心fukutoshin
1.

A designated area located somewhat distant from the main urban center, established to share and manage some of the functions and services of the core city, often serving as a hub for business and commerce.

2.

A region that possesses functionality similar to that of a city's central area, typically situated in the periphery and serving as a terminal that connects the central urban area with its suburbs.

3.

An area that has developed around the historic core of a major city, taking on some of its roles and characteristics, exemplified by locations such as Shinjuku, Shibuya, and Ikebukuro in Tokyo.

としんぶ都心部toshinbu
1.

The area within a city that is characterized by a high concentration of commercial, cultural, and governmental activities, often bustling with people and services.

2.

The central region of a metropolitan area where major transportation hubs, businesses, and attractions are typically located, serving as the core of urban life.

3.

A densely populated zone of a city marked by significant infrastructure, including skyscrapers, public transportation systems, and various amenities that cater to residents and visitors alike.