Looking at the sentence, it's is obvious that 'Amazon' is the adjective word that describes the birds in South America. Other than that, it is being capitalized because it is at the same time a nationality / race.
Social contract, because people can agree to a bad government as easily as to a good one.
We cannot be entirely sure, because you didn't write the entry where the word can be found, but nevertheless, the word <em>defalcation, </em>meaning misappropriation of money or funds held by an official, trustee, or other fiduciary, is a part of speech known as noun.
Macbeth said that to lady macbeth
