The keyword phrase "patriots day vest red sox" functions grammatically as a compound noun or noun phrase. In this construction, the primary or "head" noun is "vest." The terms "Patriots Day" and "Red Sox" are proper nouns that act as attributive nouns (or noun adjuncts), modifying the head noun to specify a particular type of vest.
In this grammatical structure, attributive nouns function like adjectives to describe or classify the noun that follows. The term "Red Sox" directly modifies "vest" to create the concept of a "Red Sox vest." The preceding term, "Patriots Day," further modifies this entire unit, specifying the context or occasion for the Red Sox vest. This sequential modification narrows the subject from a general garment to a highly specific item: a vest associated with the Red Sox baseball team, specifically linked to the Patriots' Day holiday and its traditional game.
Identifying the keyword phrase as a noun phrase is crucial because it establishes the article's main subject as a specific, tangible object. Consequently, the article's content should focus on describing this item, its design, its cultural significance in Boston, its connection to the marathon and the baseball game, and its role as fan apparel. The grammatical analysis confirms the core subject is a "thing" rather than an action (verb) or a quality (adjective), thereby guiding the entire focus and structure of the content.
