The keyword term "patriot day speech" is a noun phrase. The main point or head of this phrase is the word "speech," which is a noun. The preceding words, "patriot day," function as a modifier that specifies the type or context of the speech.
In this grammatical structure, "speech" is the head noun, establishing the phrase's core identity as a specific type of formal address. The proper noun "Patriot Day" acts as a noun adjunct (or attributive noun). A noun adjunct is a noun used to modify another noun, functioning in a role similar to an adjective. It classifies the head noun, indicating that the subject is a speech delivered on, for, or about the observance of Patriot Day.
Identifying the main part of speech as a noun is crucial because it defines the article's subject as a specific entitythe speech itself. This focus allows for analysis of the content, rhetoric, themes, and historical context of such addresses. The classification distinguishes the topic from the act of speaking (a verb) or a descriptive quality (an adjective), centering the discourse on a particular subcategory of commemorative oratory.