The term "patriots day writer" functions as a compound noun. The primary noun, or head, is "writer." The preceding proper noun, "Patriots Day," acts as a noun adjunct (or attributive noun), modifying "writer" to specify a particular type or role. It identifies a person whose professional identity is linked directly to the subject of "Patriots Day," most commonly the screenwriter(s) of the 2016 film of that name.
In this grammatical construction, a noun is used to describe another noun, functioning similarly to an adjective. "Patriots Day" is a single semantic unit that narrows the scope of the more general term "writer." It answers the question, "What kind of writer?" The answer is one associated with the specific topic of Patriots' Day. This structure is common in English for creating precise, specific terminology, such as "database administrator" or "space shuttle commander," where the initial nouns define the domain or subject of the final noun's role.
Recognizing this phrase as a compound noun is crucial because it establishes the subject as a specific individual or group defined by a single, notable work. An analysis or article would therefore focus on the creative process, research, and narrative choices made by the screenwriters (Matt Cook, Peter Berg, and Joshua Zetumer) in their capacity of adapting the events of the Boston Marathon bombing for the film. The term frames the subject not as a writer in general, but as the authorial voice of a particular, significant cultural product.