Yes, the word statesmen is a common plural noun, a word for any statesmen anywhere.
A proper noun is the name of a specific person, place, thing, or a title; for example:
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Patriotism is the abstract noun form.
The names of presidential monumants are proper nouns. Proper nouns are the unique names of people, places, or things. Common nouns are the words for general things. If a common noun is part of a name, it becomes a proper noun. Pronouns always replace proper and common nouns.
American is a proper noun. It can also be an adjective, as in "American cheese." A rule of thumb: proper nouns are capitalized and common nouns are not capitalized.
The word America is a proper noun, the name of a specific country.A common noun is a general term for any person, place, or thing; fore example country, state, city, etc.
Father McGovern is a proper noun, the name of a specific person.A proper noun is the name or title of a specific person, place, or thing (real or fictional).