"Trail" is commonly a common noun referring to a path or track. It functions as a proper noun when used as part of a specific trail name, such as "Appalachian Trail."
No, trail park is a common noun unless it is part of the name of a specific trail park.
"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.
Proper noun or common noun
The noun cassette is a common noun.
a common noun?
The answer is proper noun. Examples of common noun and proper noun are: Proper noun: Mary Collins Common noun: monkey