The keyword phrase "patriots day school holiday" functions grammatically as a compound noun or a noun phrase. The core element, or head noun, is "holiday." This is the primary subject being discussed.
In this construction, the preceding words act as modifiers, specifically as attributive nouns (nouns used as adjectives). "School" modifies "holiday" to specify its context (a holiday from school). "Patriots Day," a proper noun, further modifies the compound "school holiday" to specify the exact occasion. The grammatical hierarchy is [[(Patriots Day) (school)] holiday], where each preceding term narrows the definition of the final noun.
Identifying "holiday" as the head noun is crucial because it establishes the article's central theme. The focus should be on the observance, its status as a non-instructional day, and its implications within an educational context. The terms "Patriots Day" and "school" provide the specific scope, ensuring the content is about this particular observance for students, rather than a general history of the event or a broad discussion of academic calendars.
