The keyword phrase "september 11th day 2001" functions grammatically as a noun phrase. Specifically, it operates as a proper noun, designating a unique and specific point in time. As a proper noun, it names a particular entityin this case, a specific calendar date that has acquired significant historical and cultural identity.
In analyzing its structure, "day" serves as the head noun of the phrase. The other components act as modifiers specifying which day is being referenced. "September" is a proper noun (the name of a month) functioning as an adjective. "11th" is an ordinal number, also functioning as an adjective. "2001" is a proper noun (a year) that further specifies the date. Together, these elements form a single, cohesive nominal unit that can act as the subject, object, or object of a preposition within a sentence.
Identifying this phrase as a noun is crucial for an article because it establishes the date not merely as a temporal marker, but as the central subject of discussion. This grammatical classification allows the event itself to be the primary topic that can be analyzed, described, and referenced directly. The article can then be structured around this noun, treating "September 11th, 2001" as an event or a concept with attributes, consequences, and a distinct identity to be explored.
