Yes, the noun 'Americans' is a concrete noun, a word for the people of the United States of America; a word for physical people.
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The plural, proper noun 'Americans' is a concrete noun as a word for the people of the United States or the people of the American continents. People are physical beings.
The abstract noun form of the concrete noun 'patriot' is patriotism; a word for an emotion.
The word "All-American" as a noun is a proper noun referring to a person, an athlete. So it is a concrete noun.
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The possessive form of the plural noun Americans is Americans'.Example: Many Americans' lifestyles are harmful to the environment.