The keyword term "patriots day celebration" is a noun phrase. The main point and core part of speech is the noun "celebration." This word establishes the fundamental concept: an event or a series of activities organized to commemorate something.
In this grammatical construction, "celebration" serves as the head noun. The words "Patriots Day" function as a compound noun adjunct, which is a noun that modifies another noun, essentially acting like an adjective. "Patriots Day" specifies the particular type of celebration being discussed. Therefore, while the entire phrase names a specific event, its syntactic role in a sentence is governed by the head noun, "celebration."
Understanding this structure is critical for proper usage. For example, in the sentence "The patriots day celebration was postponed," the verb "was" agrees with the singular noun "celebration." The entire noun phrase acts as the subject of the sentence, but its grammatical number (singular or plural) is determined by the head noun. This distinction ensures syntactical correctness and clarity in writing.