The keyword phrase "Patriot Day September 11th" functions as a proper noun. It serves as the specific name for a designated day of observance in the United States. The core of the phrase, "Patriot Day," is a noun, and the addition of the date "September 11th" acts as an appositive that renames and specifies which day is being referenced, distinguishing it from other holidays.
In a grammatical analysis, a noun names a person, place, thing, or idea. A proper noun names a specific one. While "day" is a common noun, "Patriot Day" is a proper noun because it names a unique, official observance. The date "September 11th" further clarifies this proper noun, ensuring it is not confused with "Patriots' Day," a different holiday observed in April in some states. The entire construction acts as a single conceptual unitthe name of an eventmaking its primary grammatical role that of a noun.
Therefore, for the purpose of an article, the keyword should be treated as a proper noun. This dictates that the article's main point will be to define, describe, and provide context for this specific named entity. The focus is on the event itselfits history, significance, and traditionswhich is consistent with the function of a noun as the subject of discourse.
