The noun 'id' (the part of your mind that is unconscious that has hidden wants and needs) is a common noun, a word for anyone's id. The noun id is only capitalized when it is the first word in a sentence.
The word 'ID' is an abbreviation for 'identification' (a document that gives the details of your name, address, and date of birth, sometimes with a photograph) is also a common noun, a word for any ID of any kind. The abbreviation is capitalized to distinguish it from the word 'id'; this use of capitalization does not make ID a proper noun.
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
it's a common noun. a proper noun would be Spider-Man.
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
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
A common noun.
It's a common noun as it's a general name for a thing. There's nothing special or particular about it.