The keyword term functions as a noun phrase. The core of this phrase is the head noun "calendar," which is modified by the preceding term "September 11th." In this grammatical construction, "September 11th" serves as an adjectival modifier, specifying the theme or subject of the calendar.
This structure is a form of a compound noun, where a proper noun representing a date ("September 11th") acts as a noun adjunct. A noun adjunct is a noun used to modify another noun, functioning like an adjective. This is analogous to phrases like "history book" or "sports car," where the first noun clarifies the specific category of the second. The entire phrase refers to a single, specific concept: a calendar dedicated to or thematically centered on the events of that particular date.
Establishing the term as a noun phrase is critical for developing the article's focus. It confirms that the main subject is a tangible or conceptual objectthe calendar itself. Consequently, the article should explore this item: its purpose (e.g., commemorative, educational, historical), its content (images, key dates, information), its creators, or its cultural significance. This grammatical analysis directs the narrative toward a specific, thematic product rather than a general discussion of the date or calendars in the abstract.
