The noun 'crack' is a common noun, a general word for a break without complete separation of parts; a sudden, sharp noise, as of something breaking; a word for any crack of any kind.
A proper noun is the name or title of a specific person, place, or thing; for example, the Crack Shack (restaurant) in San Diego, CA or The Crack Doctor Windshield Repair also in San Diego.
The word 'crack' is also a verb: crack, cracks, cracking, cracked.
"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
it's a common noun. a proper noun would be Spider-Man.
Pencil proper or common noun
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
Camel is a common noun.