Fiancé/Fiancée : 약혼자/약혼녀 Roommate : I think there is no substitutional word for this. People normally use the word '룸메이트(roommate)' itself. Dance club : (Same with roommate) just 클럽(club) Again : 다시 Once : 한번 Twice : 두번 Marriage : 결혼 Wedding : 결혼식(more like a wedding ceremony) Engaged/Engagement (to be married) : 약혼한[adj.]/약혼[n.] Family : 가족 Move in (together into an apartment or house) : 이사하다[v.]