The keyword term "patriots day by year" functions as a noun phrase with an adverbial modifier. The core component and grammatical subject is the proper noun "Patriots Day." The subsequent prepositional phrase, "by year," acts as an adverbial element that modifies the noun, specifying the chronological arrangement of the information being discussed or sought.
A detailed grammatical breakdown reveals two parts. First, "Patriots Day" is a compound proper noun, referring to a specific holiday and acting as the central subject. Second, "by year" is a prepositional phrase, where "by" is the preposition and "year" is the object of the preposition. This phrase answers the question "how?" in relation to the subject, indicating that content should be organized or presented on a year-to-year basis. In the context of a title, heading, or search query, the entire phrase serves as a single conceptual unit identifying a topic and its organizational principle.
For the article's purpose, the main point of speech to focus on is the noun ("Patriots Day"). This is the subject of the article. The adverbial modifier ("by year") dictates the article's structure and format rather than its core topic. Therefore, the content will be about the holiday itself, with events, history, or celebrations detailed in a chronological, year-specific sequence.