• 官庁かんちょう — government office
• 警官けいかん — police officer
• 外交官がいこうかん — diplomat
• 官職かんしょく — official post, position
• 官僚かんりょう — bureaucrat
• 官報かんぽう — official gazette

官 combines 宀 (“roof”) with components suggesting authority. Under one roof, it symbolized a group under control — evolving into the meaning of officialdom, government, and administrative authority.