der Westen
west
The cardinal direction in which the sun sets.
Unser Balkon ist nach Westen ausgerichtet, deshalb haben wir Abendsonne.
Our balcony faces west, so we get evening sun.

west
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west
The cardinal direction in which the sun sets.
Unser Balkon ist nach Westen ausgerichtet, deshalb haben wir Abendsonne.
Our balcony faces west, so we get evening sun.

As a noun for a cardinal direction, 'der Westen' (the west) is almost always used with the definite article. You say 'im Westen' (in the west) for position or 'nach Westen' (to the west/westward) for direction.
Die Vögel ziehen im Herbst Richtung Süden, nicht nach Westen.
In autumn, the birds migrate south, not west.
Pay close attention to the prepositions: 'im Westen' (in the west) describes a static position, while 'nach Westen' (to the west/westward) indicates a direction of movement.
Frankfurt am Main liegt im Westen von Deutschland.
Frankfurt am Main is located in the west of Germany.
The context reveals the meaning. If it is about the sun, a compass, or weather, the cardinal direction is meant. A geographical addition like 'Deutschlands' (of Germany) points to a region. Political or historical topics refer to the western industrialized nations.
Die Beziehungen zwischen dem Westen und China sind komplex.
Relations between the West and China are complex.
When 'Westen' (west) refers to part of a country or continent, this is often made clear by a genitive or the preposition 'von' (of/from). For example: 'der Westen der USA' (the west of the USA) or 'der Westen von Kanada' (the west of Canada).
Der Westen der USA ist für seine Nationalparks berühmt.
The west of the USA is famous for its national parks.
east
'der Osten' and 'der Westen' are opposite cardinal directions. 'der Osten' is the direction of the sunrise, while 'der Westen' is the direction of the sunset. Both words can also refer to a part of a country, city, or region. Learners may confuse them because both are used in the same way: for example, you say 'im Osten' (in the east) or 'im Westen' (in the west). As a helpful tip: in the morning, the sun rises in the east; in the evening, it sets in the west.

Am Abend steht die Sonne tief im Westen.
In the evening, the sun is low in the west.
Im Osten der Stadt gibt es viele neue Wohnungen.
There are many new apartments in the east of the city.