The keyword term "patriots day film director" functions as a noun phrase. The main point and grammatical head of this phrase is the noun "director."
In this construction, the words "patriots day" and "film" act as noun adjuncts (or attributive nouns). "Patriots Day," a proper noun representing the film's title, and "film," a common noun, both modify the head noun "director." They work together to specify precisely which director is the subject: not just any director, but the one associated with the film titled Patriots Day. This creates a specific, compound subject identifier.
Understanding this grammatical structure is critical for the article's focus. It establishes that the central subject is a personthe individual who directed the film. The article should therefore center on Peter Berg, the director of the 2016 film Patriots Day, rather than on the film itself, the historical event it depicts, or its actors.