Nouns that are really names of particular people, places or things are called proper nouns. Proper nouns and titles are always written with an initial capital letter.
They include:
The names of specific people
Anna Dickson
Mr John Merton
Uncle Liam
Geographical places
Spain
The Thames
Home Farm
Glen Road
Mount Fuji
Planets and galaxies
Jupiter
Earth
Milky Way
Days of the week, months and annual religious festivals (note that the seasons are not generally considered to be proper nouns)
Thursday
June
Easter
Patented goods and trade names
Hoover
Range Rover
Samsung
Newspaper, magazine and book titles (note that only major words in a title are capitalized, but not articles or prepositions etc)
The Times
Vogue
Lord of the Rings
Names of shops, theatres and other buildings
The Odeon
Nationwide
Marks & Spencer
Titles (the polite or professional labels that we give to people)
Dr Johnson
Professor James
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