The keyword term "Patriots' Day marathon Boston" functions grammatically as a proper noun phrase. Its primary role is to name a specific, singular, and unique event. Unlike a common noun which refers to a general class of entities (e.g., "a marathon"), this phrase designates one particular annual race.
In this construction, "marathon" serves as the head noun, which is the core concept. The terms "Patriots' Day" and "Boston" act as modifiers. "Patriots' Day" is an attributive noun specifying the occasion or timing of the event, while "Boston" is a noun adjunct specifying the location. Together, these components form a compound noun that functions as a single unit to identify the Boston Marathon, which is traditionally held on the state holiday of Patriots' Day.
Recognizing the term as a proper noun phrase is critical for its application within an article. It dictates that the phrase should be treated as a single semantic unit when constructing sentences, where it can act as a subject, object, or object of a preposition. This classification ensures clarity by consistently referring to the specific, internationally recognized event, which is essential for both reader comprehension and effective search engine optimization (SEO).
