A group of words that refer to people, places, and things that are unique. In written English, they are spelled with an initial CAPITAL LETTER:
Botswana Harry
You could object that there is more than one Harry in the world, but in speech and writing when we use the word Harry it always refers to a unique individual.
Proper nouns can also consist of more than one word:
The Oxford Dictionary of English The Houses of parliament.
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