This is the 479th most frequent Japanese word.
事務
"Office work" or "administrative work."
事務 refers to office work or administrative tasks in this context.
彼女は事務所で働いています。
She works at the office.
事務 refers to the act of handling administrative or clerical tasks.
事務処理が私の主な仕事です。
Handling administrative tasks is my main job.
事務 is used as an adjective in this compound word, referring to use in an office setting.