This is the 4201st most frequent Japanese word.
主幹
"Main pillar" or "core leader."
Here, "主幹" is used to refer to the person responsible for the main control and oversight of management tasks.
この会社のプロジェクト管理の主幹を務めています。
I am in charge of the core management of this company's project.
In this sentence, "主幹" indicates the principal or chief industry within the context of the economy.
主幹産業として、観光業が地域経済を支えています。
Tourism acts as the main industry supporting the regional economy.
"主幹" here denotes the chief editor role overseeing a publication.