The keyword phrase "patriot day movie trailer" functions as a compound noun. The main point and core part of speech is a noun, specifically the head noun "trailer."
In this grammatical construction, "trailer" is the central noun that identifies the subject. The preceding words, "Patriot Day" and "movie," function as noun adjuncts (nouns used as adjectives) that modify and specify the head noun. "Movie" clarifies the type of trailer, and the proper noun "Patriot Day" identifies the specific film the movie trailer is for. Each word progressively narrows the focus, but the fundamental part of speech for the entire phrase is determined by its core subject: the trailer.
Recognizing "trailer" as the head noun is crucial because it defines the user's intent. The user is searching for a specific piece of media (a noun/thing), not an action (verb) or a quality (adjective). Therefore, an article using this keyword must be centered on the trailer itselfits content, analysis, or availabilityto directly address the subject identified by the main part of speech.
