In the keyword phrase "september 11th quiz," the main word and primary part of speech is a noun. The word "quiz" serves as the head of the noun phrase, identifying the core concept or object. The preceding term, "September 11th," functions as an adjectival modifier, specifically a proper noun acting as an adjective to describe the subject matter of the quiz.
This grammatical structure is known as a noun adjunct or attributive noun, where one noun (or a noun phrase like "September 11th") modifies another. Its function is to specify the type or category of the head noun. In this case, "September 11th" answers the question, "What kind of quiz is it?" It is not an adjective in the traditional sense but serves the same descriptive purpose. The entire three-word term operates collectively as a compound noun phrase, with "quiz" being the simple subject or main point.
Therefore, for the purpose of an article, the central theme is the "quiz" itselfan assessment, a test of knowledge, or an educational tool. The term "September 11th" provides the specific, crucial context. The article's focus would be on a quiz about the events of September 11th, making the noun "quiz" the fundamental element being discussed.
