The keyword term "patriots day mark wahlberg" functions grammatically as a proper noun phrase. A proper noun names a specific person, place, or thing, and this phrase collectively identifies a singular, specific entity: the 2016 film titled Patriots Day, specifically in the context of its association with the actor Mark Wahlberg. As a single unit, its part of speech is nominal.
This determination is based on the composition of the phrase. It consists of two distinct proper nouns: "Patriots Day" (the title of a specific film) and "Mark Wahlberg" (the name of a specific person). When used together as a keyword, they do not form a descriptive adjectival phrase or a verbal action. Instead, they operate as a compound identifier, where one proper noun (Mark Wahlberg) modifies or specifies the other (Patriots Day) to narrow the subject to a unique cultural artifact. The phrase functions identically to a single name, pointing to one subject.
Understanding this keyword as a proper noun phrase is crucial for content creation. It establishes that the article's main point must be the specific entity named. The content should not treat the words individually but as a unified topic. Therefore, the article's focus must be on the film Patriots Day and Mark Wahlberg's specific involvement, such as his performance, his role as a producer, or the film's narrative from the perspective of his character. The grammatical function dictates that the subject is not abstract but a concrete, named thing.