The keyword phrase "September 11 Patriot Day" functions as a proper noun. It is a specific, formal title for a designated day of observance in the United States. Although composed of multiple words, the entire phrase operates as a single grammatical unit that names a unique entity.
In this construction, the core or head noun is "Day." The words preceding it act as adjectival modifiers. "Patriot" functions as a noun adjunct, specifying the character of the day. "September 11" further specifies which "Patriot Day" is being referenced, distinguishing it from other observances. The entire capitalized phrase, "September 11 Patriot Day," therefore acts as a single noun phrase, akin to other formal titles like "Martin Luther King, Jr. Day" or "New Year's Eve."
Recognizing the term as a proper noun is the crucial main point for writing the article because it dictates its grammatical treatment. As a singular subject, it requires a singular verb (e.g., "September 11 Patriot Day is a national day of remembrance."). It also requires capitalization as a formal title. This classification ensures the term is treated as the specific name of an event rather than a generic descriptive phrase, providing clarity and formal accuracy.
