"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
The word 'alpine' (or Alpine) is the adjective form of the proper noun Alps (The Alps is a mountain range in Europe).The adjective 'alpine' describes a noun as of or from The Alps region.
Common
It is a proper noun, because it is the name of a specific thing.
proper
Some common nouns for the proper noun 'Alaska' are state or peninsula.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
The word 'alpine' (or Alpine) is the adjective form of the proper noun Alps (The Alps is a mountain range in Europe).The adjective 'alpine' describes a noun as of or from The Alps region.
The common nouns for the word Alps are mountains or mountain range.
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.