The noun mystery is a common noun, a word for any mystery of any kind.
A proper noun is the name of a person, place, thing, or a title; for example:
The noun mystery is a common noun, a word for any mystery of any kind.A proper noun is the name of a person, place, thing, or a title; for example:Mr. Mystery, mystery-fiction series by James Lee (Jim Aitchison)Mystery Island, Vanuatu (Oceania)Mystery Spot, Santa Cruz, CA (see link below)"Manhattan Murder Mystery", 1993 movie with Woody Allen, Diane Keaton
As a name of a road , Park Avenue', it is a proper noun, and both words star with a capital letter. However, when used separately, as 'the park, or 'the avenue', they are common nouns and so not need a capital letter.
It is a proper noun, because it is the name of a specific thing.
Proper noun
proper
The noun 'corn' is a common noun, a general word for the seeds of a cereal plant; the plants that produce these seeds; a spot of hardening and thickening of skin; a word for a thing.
it's a common noun. a proper noun would be Spider-Man.
Pencil proper or common noun
The noun cassette is a common noun.
a common noun?
Camel is a common noun.
The answer is proper noun. Examples of common noun and proper noun are: Proper noun: Mary Collins Common noun: monkey