The keyword term "patriots day movie deaths" is a noun phrase. The main point and the grammatical head of this phrase is the plural noun "deaths." The words "Patriots Day" (a proper noun) and "movie" (a noun) function together as adjectival modifiers, specifying the context of the head noun. The primary subject is therefore the concept of fatalities.
A detailed grammatical analysis shows that "deaths" is the core subject of the query. The term "movie" acts as an attributive noun, narrowing the scope from any deaths to only those depicted in a film. The specific proper noun "Patriots Day" further modifies the phrase, pinpointing the exact 2016 film being referenced. This structure creates a highly specific and searchable concept: the portrayal of mortality within that particular cinematic work.
In practice, this grammatical function dictates that an article should focus on providing a factual account of the specific fatalities portrayed or discussed within the film. The content would detail the on-screen deaths of the bombing victims (Krystle Campbell, Martin Richard, Lingzi Lu), MIT Police Officer Sean Collier, and the perpetrator Tamerlan Tsarnaev. The noun "deaths" as the main point requires the content to be a direct and informative summary of these specific narrative events.