The keyword term "Patriots Day Boston Marathon bombing" functions as a compound noun or noun phrase. The main part of speech, which represents the core subject, is the final word: the noun "bombing".
In this grammatical construction, the preceding proper nouns "Patriots Day" and "Boston Marathon" act as attributive nouns (or noun adjuncts). They function like adjectives, modifying the head noun ("bombing") to specify the event's context. "Patriots Day" identifies the timing (the holiday), and "Boston Marathon" identifies the specific occasion. The entire phrase collectively names a single, specific historical event.
This determination is critical because it establishes that the article's central subject is the act of the "bombing" itself. The phrases "Patriots Day" and "Boston Marathon" provide essential contextthe time and placebut the primary focus of analysis, discussion, and narrative should remain on the bombing event, its perpetrators, victims, and consequences. This grammatical structure guides the article to treat the holiday and the race as the setting for the main point, which is the attack.
