Looks like no one added any tags here yet for you.
competition (n)
an organised event in which people try to win prizes by being better than other people ( cuộc thi)
opponent (adj)
someone who is competing against you (đối thủ)
organise
to prepare or arrange an activity or event ( tổ chức)
referee
someone whose job is to make sure that players in a game obey the rules (trọng tài)