american
The Italian word 'americano' is used in the same context as 'American' in English. It's an adjective used to describe something or someone from the United States. For example, 'un film americano' means 'an American film'.
My friend is American.
This sentence states the nationality of the subject's friend. In Italian, nationalities are not capitalized unless they start the sentence.
He is reading an American book.
This sentence specifies the origin of the book that is being read. In Italian, the nationality adjective 'americano' is used to denote origin or characteristic of something rather than describing the possession of an object.
American coffee is different from Italian coffee.
This sentence is comparing American coffee to Italian coffee. This can be used to tackle comparisons in Italian. Also, it shows how 'americano' and 'italiano' are used as adjectives to describe the nationality of the coffee.