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.
No, they don't.
proper
common and proper
common
common
It is a proper noun, because it is the name of a specific thing.
it's a common noun. a proper noun would be Spider-Man.
Proper
Pencil proper or common noun
It's a common noun as it's a general name for a thing. There's nothing special or particular about it.
Proper noun