ugyuj
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
Common
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.
Yes, sleep is a common noun.
Proper noun or common noun
The noun cassette is a common noun.
a common noun?