The keyword term "patriots day cast special agent" functions grammatically as a compound noun or noun phrase. It operates as a single conceptual unit to identify a specific entity: an actor (cast member) who portrayed a special agent in the film "Patriots Day." In this construction, "Patriots Day" acts as a proper adjective modifying "cast," and the entire phrase "patriots day cast" modifies the final noun, "special agent," to create a highly specific identifier.
The function of this phrase is to narrow a broad category down to a precise subject. The head noun is "agent," which is part of the compound noun "special agent." The preceding words, "Patriots Day" and "cast," serve as modifiers that provide context and specificity. This layered modification moves from the general (agent) to the specific (a character in the cast of a particular film). This structure is typical of search queries and topic headings where the goal is to isolate a distinct piece of information rather than to form a complete grammatical sentence.
For the purpose of an article, establishing this keyword as a noun phrase is crucial because it defines the article's subject. The main point is not an action (verb) or a quality (adjective) but a person or role. Therefore, the article's content should focus on identifying and describing this subject. This would involve discussing the specific actor(s) who played FBI or other special agents in the film, such as Kevin Bacon's portrayal of Special Agent Richard DesLauriers, detailing the character's role in the narrative, and the actor's performance.