Capitalization in English:
In English, only proper nouns (names of specific people, places, things, etc.) are capitalized. This includes:
* Names of people: John, Mary, Emily
* Names of places: London, Paris, Mount Everest
* Names of organizations: United Nations, Google, Amazon
* Names of days of the week: Monday, Tuesday, Wednesday
* Names of months: January, February, March
Other Languages:
Most other languages have different capitalization rules. Some languages don't capitalize nouns at all, while others may capitalize them in specific contexts.
For example, in German, all nouns are capitalized, regardless of whether they are proper nouns or common nouns.
Therefore, there is no language where all nouns start with a capital letter.