The word 'a' is a noun, the first letter of the English alphabet; and an indefinite article (also called a determiner) that precedes a noun that starts with a consonant indicating that the noun is singular and that it's not a specific person or thing.
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Proper noun
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
"night" is a noun
The noun cassette is a common noun.
No, the noun shelf is a common noun, a word for any shelf.