世せ界かい各かっ国こく

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Meanings

countries around the world; all nations

Refers to the countries of the world collectively, often used in contexts like international news, global surveys, or worldwide events.

世せ界かい各かっ国こくから〈人ひと〉が集あつまるpeople gather from countries all over the world
このイベントには世せ界かい各かっ国こくから観かん光こう客きゃくが集あつまる。
Tourists from countries around the world gather for this event.
世せ界かい各かっ国こくで〈事こと〉が行おこなわれるsomething is held/carried out in countries around the world
その調ちょう査さは世せ界かい各かっ国こくで行おこなわれている。
The survey is being conducted in countries around the world.
世せ界かい各かっ国こくに〈事こと〉が広ひろがるsomething spreads to countries around the world
その技ぎ術じゅつは世せ界かい各かっ国こくに広ひろがった。
The technology spread to countries around the world.

世せ界かい中じゅうN4
世界中 emphasizes the global extent of something ('all over the world'), while 世界各国 highlights the individual countries themselves.
各かっ国こくN1
各国 just means 'each country' without specifying the world, whereas 世界各国 explicitly means each country in the whole world.
諸しょ国こくN1
諸国 is a more literary/formal word for 'various countries,' often used in historical or diplomatic contexts, while 世界各国 is the everyday news-style term.
万ばん国こく
万国 is an old-fashioned, formal word for 'all nations' seen in fixed terms like 万国博覧会, while 世界各国 is the standard modern expression.
世せ界かい各かく地ち
世界各国 specifically means 'countries around the world', while 世界各地 refers more broadly to places or regions, not limited to national units.

Compound of 世界 (world) + 各国 (each country, various countries).