公

Meaning - Public / Shared / Equal

Korean syllable - 공

Korean name - 공평할 공

Examples

公園 - 공원 - Public park

主人公 - 주인공 - Hero, Leading role in a story

公主 - 공주 - Princess

市

Meaning - City

Korean syllable - 시

Korean name - 저자 시

Examples

市民 - 시민 - Citizen

市內 - 시내 - Downtown

者市 - 도시 - City

區

Meaning - District / Division

Korean syllable - 구

Korean name - 지경 구

Examples

區民 - 구민 - Inhabitants of a district

區域 - 구역 - Area / District

龍山區 - 용산구 - Yongsan-gu / Yongsan district. One of the 25 districts in Seoul. (pictured)

洞

Meaning - Neighborhood

Korean syllable - 동

Korean name - 골 동

Examples

洞內 - 동내 - Inside a neighborhood

洞口 - 동구 - The entrance to a neighborhood

梨泰院洞 - 이태원동 - Itaewon-dong / Itaewon neighborhood. A neighborhood in Yongsan-gu. (pictured)

合

Meaning - Combine / Unite

Korean syllable - 합

Korean name - 합할 합

Examples

統合 - 통합 - Integration

團合 - 단합 - Unity, Solidarity

合意 - 합의 - Agreement

Source :https://www.howtostudykorean.com/hanja-unit-1-lessons-1-20/hanja-lesson-14/

Hanja Lesson 14: 公, 市, 區, 洞, 合