The main point of the keyword term "Patriots Day film trailer" is the word trailer, which functions as a noun. In this grammatical construction, "trailer" is the head noun, establishing the core subject of the phrase.
The phrase is a noun phrase where "Patriots Day" and "film" act as noun adjuncts (or attributive nouns). "Patriots Day," a proper noun, and "film," a common noun, both serve to modify and specify the head noun "trailer." They answer the questions "Which trailer?" and "What kind of trailer?" respectively. The entire phrase refers to a specific object: a promotional video (the trailer) for a particular creative work (the film titled Patriots Day).
Identifying "trailer" as the main noun is critical because it dictates the article's focus. The central topic is not the film itself, its plot, or its historical basis, but rather the specific marketing material created to promote it. The article should therefore analyze the trailer's content, editing style, musical score, marketing strategy, and audience reception, as these elements all relate directly to the head noun.
