The keyword term "patriots day poster" functions grammatically as a noun phrase. The principal part of speech is noun, with "poster" serving as the head noun that identifies the core subject.
In this construction, the proper noun "Patriots Day" acts as a noun adjunct, also known as an attributive noun. A noun adjunct is a noun that modifies another noun, effectively functioning as an adjective. Here, "Patriots Day" specifies the theme, subject, or type of the "poster," answering the question, "What kind of poster is it?" This is a standard grammatical structure in English used to create specific and descriptive compound terms (e.g., "kitchen table," "winter coat").
Understanding this classification is crucial because it establishes that the article's main point is an object or a class of objects. Therefore, the content should focus on analyzing these specific posterstheir visual elements, historical context, design principles, symbolism, or purpose in commemorating the event. This grammatical clarity ensures the article centers on a tangible subject rather than an action or an abstract concept.