"pyramids" is a common noun.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
No, it is a plural noun. The classic Egyptian pyramids could be a capitalized proper noun.
It is a proper noun, because it is the name of a specific thing.
proper
Proper noun
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?
Camel is a common noun.
The answer is proper noun. Examples of common noun and proper noun are: Proper noun: Mary Collins Common noun: monkey