The keyword term "patriots day film jimmy o yang" functions as a compound proper noun or a noun phrase. It operates as a single grammatical unit that names a specific, unique subject: the intersection of the actor Jimmy O. Yang with the 2016 movie "Patriots Day." Its primary grammatical role is to act as the subject of a sentence or the title of an article.
This determination is based on the components of the phrase. "Patriots Day" is a proper noun (the title of the film), "film" is a common noun specifying the medium, and "Jimmy O. Yang" is a proper noun (the name of the actor). When combined in this order, they do not describe an action (verb) or modify another word (adjective/adverb). Instead, they collectively form a specific identifier, similar to a title like "The Lord of the Rings trilogy" or "Star Wars character Luke Skywalker." The phrase's function is purely nominative; it names the topic of interest.
Therefore, for the purpose of an article, this noun phrase is the central subject. The article's content would provide predicate information about this subject, such as detailing the character Jimmy O. Yang portrayed (Dun Meng), analyzing his performance, or discussing the significance of his role within the film's narrative. The grammatical classification as a noun phrase establishes it as the core topic to be explained and elaborated upon.