동시simultaneousness; concurrence 공동collaboration 공동생활communal life 공동적being common 공동체community 동the 동갑same age 동기sibling 동기same period 동기간sibling relationship

교우friend 교우school friend; colleague 우정friendship 학우school friend; classmate 교우brethren 급우classmate 문방사우The Four Friends of the Study 문우literary friend 우군ally; friendly forces 우방friendly nation; ally

회사company; corporation 회사원employee; office worker; staff 회원member 회의meeting; conference 교회church 기회chance; opportunity 대회meeting; convention 토론회debate; panel discussion 학생회student's association; student council 학생회관student center