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This hanja means “mouth.” It also carries meanings like “entrance” or “opening.” It’s used widely in both simple and more complex vocabulary!

Let’s look at some Sino-Korean words that contain the character 口 (구).
- 식구 (食口) family member (literally “eating mouths”)
- 항구 (港口) port, harbor
- 인구 (人口) population (literally “number of mouths”)
- 입구 (入口) entrance
- 가구 (家口) household, family (literally “family mouths”)
- 창구 (窓口) counter (e.g., bank, ticket)
- 출구 (出口) exit
- 구취 (口臭) bad breath
- 구호 (口號) slogan, cheer
- 출입구 (出入口) entrance and exit
- 배수구 (排水口) drainage hole
- 투입구 (投入口) input slot, insertion slot
- 비상구 (非常口) emergency exit
- 구술시험 (口述試驗) oral exam
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