"Grand opening" is a common noun. It refers to a general event or occasion marking the official opening of a business or establishment. It is not capitalized unless it is part of a specific title or name, such as "Grand Opening of Joe's Coffee Shop."
No, Grand Canyon is a proper noun; it is the name of a specific place, names are always proper nouns. A proper noun is always capitalized.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
No, "canyon" is a common noun. A proper noun would be a specific name given to a canyon, such as "Grand Canyon" or "Bryce Canyon."
It is a proper noun, because it is the name of a specific thing.
proper
Proper noun
In this context, it is common. A specific canyon, like the Grand Canyon, is proper.
Pencil proper or common noun
it's a common noun. a proper noun would be Spider-Man.
Proper noun or common noun
The noun cassette is a common noun.
a common noun?