The keyword term "september 11th celebrity birthdays" functions grammatically as a noun phrase. In this construction, the central element is the noun "birthdays," which serves as the head of the phrase. The preceding words act as modifiers that specify and describe this head noun.
A detailed grammatical breakdown shows that "birthdays" is a plural noun. The word "celebrity," which is a noun, functions here as a noun adjunct (or attributive noun), effectively acting as an adjective to describe the type of birthdays. The specific date, "september 11th," operates as an adjectival phrase modifying "birthdays" by specifying which birthdays are being discussed. The combination of these modifiers narrows the general concept of "birthdays" to a very precise and specific subject.
This classification is crucial because it establishes the keyword's role as the primary subject or topic of the article. As a noun phrase, it identifies a specific entity or concepta list, a collection of facts, an event categorythat the content will explore. The article's main point, therefore, is to present information about this defined subject, rather than to perform an action (verb) or describe a quality (adjective).
