The keyword phrase "serangan 11 september gedung wtc" is a compound noun. The primary part of speech that functions as the main point is the head noun "serangan," which translates to "attack" or "assault." The subsequent words, "11 September" (September 11th) and "gedung WTC" (WTC building), act as modifiers. "11 September" specifies the date, and "gedung WTC" specifies the target. Therefore, the core concept of the phrase is the event of an attack.
In Indonesian grammatical structure, the head noun typically precedes its modifiers (Noun + Modifier). In this case, "serangan" (attack) is the head. It is described and specified by the date "11 September" and the location "gedung WTC." This structure is the inverse of the common English construction, which would place the modifiers first: "The September 11th WTC building attack." This linguistic analysis reinforces that "serangan" is the central grammatical and conceptual element, with all other parts of the phrase serving to provide context and detail to this main noun.
From an analytical standpoint, identifying "serangan" as the main noun is critical. It establishes that the primary subject for any article using this keyword is the event of the attack itself. The focus should be on the action, its execution, and its consequences. The date and location are essential but secondary details that define the scope of this primary subject. Consequently, for the purpose of writing an article, the main point derived from this keyword is the noun "attack" (serangan).