The keyword phrase "Patriots Day holiday" functions as a noun phrase. The core or "head" of this phrase is the word "holiday," which is a noun. The term "Patriots Day" acts as a modifier, specifying the type of holiday.
In grammatical terms, "Patriots Day" is a proper noun that serves as a noun adjunct (or attributive noun). This means it behaves like an adjective to describe the noun that follows it ("holiday"). This structure is common in English, as seen in phrases like "government building" or "apple pie," where "government" and "apple" are nouns modifying "building" and "pie." Therefore, while composed of multiple words, the entire unit "Patriots Day holiday" names a specific entity and functions syntactically as a single noun.
For the purpose of an article, the main point of speech to consider is noun. This classification dictates that the phrase will be used in sentences to name a subject, a direct object, or the object of a preposition. Understanding it as a noun is crucial for constructing grammatically correct sentences around this central topic.
