The keyword phrase "patriots day and boston marathon" functions grammatically as a compound noun phrase. Its constituent parts, "Patriots Day" and "Boston Marathon," are both proper nouns.
A proper noun names a specific, unique entity, which is why each word is capitalized. "Patriots Day" refers to a specific American civic holiday, while "Boston Marathon" designates a particular annual sporting event. The coordinating conjunction "and" links these two distinct proper nouns, causing them to function as a single grammatical unit. This unit can act as the subject, object, or complement within a sentence, referring collectively to the two intertwined events.
Identifying the keyword as a noun phrase is crucial because it dictates that the article's primary focus must be descriptive and informational. The main point is not an action (verb) or a quality (adjective), but rather the entities themselves. Therefore, the article's content should define these events, explain their individual significance, and, most importantly, explore the historical, cultural, and logistical relationship between them.
