The keyword phrase functions as a noun phrase. In this context, it acts as a single conceptual unit representing the subject of an inquiry. The core of the phrase is the compound noun "September 11 holiday," which is the entity being discussed. The final word, "called," is a past participle that signals the user's intent to find the specific, proper name associated with this entity.
From a grammatical and analytical perspective, the term "September 11" acts as an adjectival modifier specifying the noun "holiday." This entire unit, "September 11 holiday," is the subject that needs to be defined. The syntax of the phrase, particularly the inclusion of "called," indicates that the keyword's purpose is not just to discuss the topic but to directly answer an implicit question: "What is the holiday on September 11 called?" Therefore, the analysis moves beyond simple parts of speech to identify the semantic function, which is to solicit a proper noun as the resolution.
In practical application for an article, this determination is crucial. The main point of the article must be to provide and explain the proper name for the observance. The thesis should directly state that September 11 is federally designated in the United States as "Patriot Day" and also the "National Day of Service and Remembrance." The article's content would then be structured to define these terms, explain their origin and significance, and clarify their status as national days of observance rather than official federal holidays.
