to join

참여하다

participate (join an activity/process)

가입하다

join (membership, organization)

합류하다

join (team/group, formal)

동참하다

join/support together (collective action)

결합하다

combine (formal, abstract/technical)

결합되다

be combined

합치다

combine (basic but still used)

통합하다

integrate (systems, organizations, data)

통합하다

integrate/merge (very important)

합병하다

merge (companies, organizations)

융합하다

fuse (technologies, fields)

일원화하다

unify under one system

병합하다

merge (technical/formal)

혼합하다

mix (materials, ideas)

섞다

mix (basic)

융합되다

be fused/combined (formal)