The compound noun 'model plane' is a common noun, a general word for a small replica of an aircraft; a word for any model plane of any kind.
A proper noun is the name of title of a specific person, place, or thing; for example, a Revell 1:48 Spitfire MKII or Model Airplane News Magazine.
Proper noun
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
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.
The word 'Chevette' is a proper noun, the name of a car model made by Chevrolet.
a common noun?
Camel is a common noun.