Yes, the noun 'Americans' is a concrete noun, a word for the people of the United States of America; a word for physical people.
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.
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 proper noun Phoenix (city in Arizona) is a concrete noun. The common noun phoenix would be a mythological creature, which if encountered would also be a concrete noun.
No, Americans is not a collective noun. The collective noun that would represent Americans as a group would be country, nation, people, electorate, etc...
Concrete. (You can see it, feel it, bite it!)
Concrete. It refers to something physical that you can reference directly. Additionally, it's a proper noun, which denotes the name of a place. An abstract noun would be "love" or "sickness" which you can't point to. A concrete, but common, noun would be "planet" instead of Mars.
The noun 'cafeteria' is a concrete noun as a word for a physical place.
The noun 'authority' is an abstract noun, a word for a concept or idea. There is not corresponding noun for authority; a concrete noun would have to be the specific person that has authority. For example, the principal of the school has authority, but 'principal' is also a concept, not the person. So the concrete noun would be Ms. Washington the Principal, or perhaps Police Chief Wiggam.
Proper Noun
Police would be a concrete noun. You can see police, you can (though I wouldn't recommend it) touch police, you can also hear police. If you are able to use your senses to identify the noun, then it is concrete.
The noun 'Philadelphia' is a concrete noun, a word for a physical place.
Concrete. (But few bathtubs are made out of concrete.)
Games are activities, and activities are neither abstract nor concrete. A game to mean the collection of equipment and rules (such as found in a boxed game) would be a concrete noun.