The keyword term "holiday today september 11" functions as a noun phrase. In this construction, the core word is the noun "holiday," which is being modified by the temporal adverb "today" and the specific proper noun "September 11." The entire phrase operates as a single conceptual unit naming the subject of inquiry.
A detailed grammatical analysis reveals that "holiday" serves as the head of the phrase. The terms "today" and "September 11" act as postpositive modifiers, specifying the time and date relevant to the core noun. Although structured like a search query rather than a complete sentence, its role as a topic heading or search term solidifies its classification as a noun phrase, as it names a specific concept or question to be explored.
Determining this part of speech is crucial because it establishes the article's primary objective: to define, describe, and provide information about a specific entity (the status of September 11 as a holiday). The article will therefore be expository in nature, answering the "what" or "is" questions implied by the noun phrase, rather than describing an action (verb) or a quality (adjective). This focus dictates a content structure centered on facts, definitions, and the official status of the date as a day of observance versus a public or federal holiday.
