No, cousin is not a proper noun, it is a common noun, a general word for the child of your aunt or your uncle.
A proper noun is the name of a specific person, place or thing; for example, the movie My Cousin Vinny, Two Cousins' Lobster Shack, or Cousin Lane in London UK.
The word cousin is a common noun, the word Scott is a proper noun. When used to name the person, Cousin Scott, you can use cousin as a proper noun.
Boston
The common noun is cousin.
The noun 'max' (lower case m) is a common noun, a shortened form of the noun maximum.The noun 'Max' (capital M) is a proper noun, the name of a person; often a shortened form of the name Maximilian or Maxwell.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
The word cousin is a common noun, the word Scott is a proper noun. When used to name the person, Cousin Scott, you can use cousin as a proper noun.
"Cousin" is a common noun that refers to a general relationship within a family. It becomes a proper noun when used with a specific name, such as "Cousin Sarah."
Boston
The proper noun in the sentence is "Boston," and it should be capitalized as it is the name of a specific city.
The nouns in the sentence "Their daughter Mary is your favorite cousin" are "daughter," "Mary" (a proper noun), and "cousin."
A proper noun is the name of a specific person, place, or thing. Example sentence: This outfit was a gift from my cousin, Summer.
"Cousin" is a common noun.
The noun 'max' (lower case m) is a common noun, a shortened form of the noun maximum.The noun 'Max' (capital M) is a proper noun, the name of a person; often a shortened form of the name Maximilian or Maxwell.
The common noun is cousin.
The possessive noun form of "cousin" is "cousin's." This form indicates that something belongs to or is related to a cousin.
"Park Avenue" is a proper noun, because it is a place. Proper nouns like this should always be capitalized.
The noun cousin is the singular form; the plural noun is cousins.