The keyword term "patriots day cast katie" functions grammatically as a noun phrase. In this construction, "Patriots Day" acts as a proper noun functioning as an adjective modifying the head noun "cast." The final proper noun, "Katie," serves as a post-positive modifier, specifying a particular individual within that cast. The entire phrase operates as a single unit to identify a specific person.
This type of structure is a nominal compound, common in search queries and headlines, where nouns are stacked to progressively narrow a subject. "Cast" is limited by "Patriots Day," and that specific group is further refined to the individual "Katie." The implied relationship is possessive or descriptive ("Katie [from the] cast [of] Patriots Day"). The primary grammatical function is to name a specific entity, which is the essential role of a noun or noun phrase.
For the purpose of an article, this keyword must be treated as a proper noun. It refers to a distinct individual and should be used in sentences as a subject or object. The person identified by this noun phrase is actress Katie Nolan, who portrayed Katherine Russell in the 2016 film Patriots Day. Understanding its function as a noun is critical for constructing grammatically correct sentences around the topic.
