Grammatically, the term "patriot day director" functions as a noun phrase. The core or head of the phrase is the noun "director." The proper noun "Patriot Day" acts as a noun adjunct, which is a noun used to modify another noun, effectively serving the role of an adjective. It specifies which director is being referenced.
This construction identifies a specific individual: Peter Berg, the director of the 2016 film titled Patriots Day. The phrase isolates him from all other directors by using the title of his notable work as a qualifier. The modifier "Patriot Day" narrows the meaning of the head noun "director" to a singular, context-specific person associated with that particular film project.
In practical application, this noun phrase is used as a specific identifier in journalistic, critical, or academic writing. It serves as a concise descriptor, often preceding the individual's name (e.g., "Patriot Day director Peter Berg discussed...") to immediately establish the person's relevance to the topic at hand without needing a more verbose clause like "Peter Berg, who is the director of the film Patriots Day."
