A public bus; short for 公共汽车 gōng​gòng​qì​chē

A car provided by an organization, government agency, or company for official use.

(literary) An ancient war chariot or official carriage

(historical) An office in the Han Dynasty responsible for receiving memorials and petitions from the public; also refers to candidates traveling to the capital for exams

(historical) A Chinese compound surname 公车氏 gōng​jū​shì