The keyword term functions as a proper noun. While composed of a modifier ("September 11th") and a head noun ("attacks"), the entire phrase operates as a single unit to name a specific, unique historical event. Its role as a proper noun is the main point for grammatical and stylistic consistency.
Grammatically, the phrase is a noun phrase where "attacks" is the core noun. The specific date, "September 11th," acts as a proper adjective, modifying the noun by specifying which attacks are being referenced. The capitalization of "September" and the specificity of the date transform the common noun "attacks" into a unique identifier for the series of terrorist events that occurred in the United States in 2001. This distinguishes it from any other attack that might happen on that date.
Recognizing this term as a proper noun is crucial for writing the article because it dictates consistent capitalization rules (e.g., September 11th attacks). It also establishes the subject as a singular, defined event, ensuring the article's focus remains on this specific historical occurrence rather than a general discussion of attacks. This grammatical classification ensures clarity, formality, and historical accuracy throughout the text.
