The term "Patriots' Day" functions as a proper noun. It is the specific name of a holiday, and as a proper noun, it identifies a unique entity rather than a general class of things. The provided query "patriots day day" is a typographical repetition; the correct term is "Patriots' Day".
Grammatically, the phrase is a compound noun. The word "Patriots'" is the plural possessive form of the noun "patriot," and it acts as an adjectival modifier for the noun "Day." This possessive structure signifies that the day is dedicated to or commemorates specific historical patriots. The combination of these words creates a single lexical unit that names a particular civic holiday, cementing its classification as a proper noun.
In practical application for writing, "Patriots' Day" must be capitalized and is used in sentences just as any other name. It can serve as a subject ("Patriots' Day is a state holiday."), a direct object ("Many people celebrate Patriots' Day."), or an object of a preposition ("The parade is held on Patriots' Day."). Recognizing its function as a proper noun is essential for correct capitalization and grammatical usage.
