The noun 'kraft' (lower case k) is a common noun, a word for a tough type of brown paper used chiefly for bags and wrapping paper.
The noun 'Kraft' (capital K) is a proper noun, the name of a company (Kraft Foods Group Inc., Northfield, IL USA) and the products they sell.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
proper
Common
common
It is a proper noun, because it is the name of a specific thing.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
proper
No, they don't.
Common
common and proper
common
It is a proper noun, because it is the name of a specific thing.
common
it's a common noun. a proper noun would be Spider-Man.
Proper
Pencil proper or common noun
if you are talking about if it is a common noun or a proper noun, it is a proper noun.