The word 'each' is not a noun. The word each is:
readbook
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A proper noun is a specific name that identifies a particular person, place, or organization, distinguishing it from common nouns, which are general names. For example, "city" (common noun) can be specified as "New York" (proper noun), "book" (common noun) can be "Harry Potter" (proper noun), and "company" (common noun) can refer to "Apple Inc." (proper noun). Proper nouns are typically capitalized to highlight their specificity.
A proper noun is a noun that refers to one specific object; because neighbours refers to a group, it is a common, or improper noun.
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.
The noun 'continents' (the plural form of 'continent') is a common noun, a general word for a large mass of land.The noun 'continents' is a concrete noun, a word for a physical thing.
Camel is a common noun.
Th word tail is a common noun because the first letter of a proper noun is capitalized.