The word 'it' is not a noun, 'it' is a pronoun, a word that replaces a noun. A pronoun can replace a common or a proper noun. Example:
common noun: Bring the firewood in here, itbelongs in this bin.
proper noun: They tore down the Boise Middle School. It was on that corner.
common noun
Common
Common noun
common
Pea is a common noun, and peas is the plural...still a common noun.
A common noun.
Most definitely a common noun.
Camel is a common noun.
Th word tail is a common noun because the first letter of a proper noun is capitalized.
common
it is re@lly @ common noun
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.