The common noun for the proper noun Japan is country.A proper noun is always capitalized.
The nouns in the sentence are:Mount Fuji, a proper noun, the name of a specific mountain;volcano, a common noun, a general word for a geologic feature;Japan, a proper noun, the name of a specific country.
"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
A proper noun is the name of a specific person, place, or thing.A proper noun for the common noun 'place' is the name of a place; for example:Alabama or AlgeriaCape of Good Hope or Cape CodAsia or AfricaTokyo, Japan or the Little Tokyo neighborhood in the East Village of New York City
"Shinto" is a proper noun; it is a religion/philosophy common in Japan.