The keyword term functions as a noun phrase. In this construction, the word "actor" is the head noun, which is the core subject. The proper noun "Patriots Day" serves as an adjectival modifier, specifying and narrowing the focus of the head noun. Therefore, the central part of speech is the noun.
Grammatically, the structure involves an attributive noun (or noun adjunct), where a noun ("Patriots Day") modifies another noun ("actor"). This is a common English construction used for precision, similar to phrases like "business school" or "film festival." The modifier "Patriots Day" answers the question "Which actor?" by linking the person to the specific 2016 film. The analysis confirms that while "Patriots Day" is a proper noun on its own, its function within this specific phrase is adjectival.
For the purpose of an article, the main point should be the noun: the person or people. The article's subject is not the concept of a film title but the specific individuals who performed in it. The modifier provides the essential context, but the content should focus on identifying, describing, and detailing the actors themselves. The keyword signals user intent to find information about a person, a tangible noun.
