The keyword phrase "911 ztm" functions grammatically as a noun. Specifically, it operates as a proper noun or a compound noun, as it is being used as a unique name or identifier for a specific topic, project, or concept. Its role is to name the subject of discussion rather than to describe an action, quality, or relationship.
This classification is derived from its syntactic function. A term's part of speech is determined by its use within a sentence. As the central keyword for an article, this term will act as the subject (e.g., "911 ztm is a complex issue.") or object (e.g., "This article analyzes 911 ztm."), both of which are nominal roles. The term is a compound construction, combining a numeral ("911") and an initialism ("ztm"), which together form a single lexical unit that names a particular entity or idea.
Treating the term as a noun is the crucial first step for the article's structure, as it establishes the keyword as the central entity to be defined, analyzed, and discussed. This grammatical foundation ensures that sentences are constructed logically around it, positioning it as the main point of focus for the reader, analogous to how a title or a specific brand name functions within a text.
