The keyword term "Patriots Day parade in Boston" functions grammatically as a noun phrase. A noun phrase is a group of words, centered around a head noun, that collectively serves the role of a noun within a sentence, such as acting as a subject, object, or complement. The central or "head" noun in this construction is "parade."
A detailed grammatical analysis shows how the components modify the head noun. "Parade" is specified by two modifiers. The first is "Patriots Day," a compound proper noun that functions as a noun adjunct (or adjectival noun), indicating the specific occasion or type of parade. The second is "in Boston," a prepositional phrase that functions as an adjectival phrase, specifying the location of the parade. These modifiers work together to create a single, highly specific conceptual unit.
Recognizing the term as a noun phrase is crucial for its correct application in writing. It can stand as the complete subject of a sentence (e.g., "Patriots Day parade in Boston is a historic event.") or as an object of a verb or preposition (e.g., "Thousands of people attend the Patriots Day parade in Boston."). This grammatical classification dictates how the term integrates into larger sentence structures to convey precise information about the specific event.
