The keyword term "september 11th poster" functions as a noun phrase. In this construction, the word "poster" is the core noun, or head, which identifies the primary subject as a type of object. The preceding term, "September 11th," acts as an adjectival modifier that specifies the theme or context of the poster.
Grammatically, "September 11th" is a proper noun that serves as a noun adjunct or attributive noun. It modifies the head noun "poster" by answering the question "what kind of poster?" This is a common structure in English used to create a specific, compound concept (e.g., "kitchen table," "history lesson"). The entire phrase refers to a specific class of itemsposters related to, depicting, or commemorating the events of September 11, 2001. It does not function as a verb (an action) or an adjective (a descriptor of another noun) on its own.
This grammatical classification is critical because it establishes that the main point of the article must be the posters themselves as tangible or conceptual subjects. The article's focus should be on analyzing these objectstheir visual language, messaging, historical significance, cultural impact, or use in commemoration or propaganda. By identifying the keyword as a noun phrase, the article is framed to explore and explain a category of things, rather than an action or an abstract quality.
