He is my greatest opponent.

Communication with the interlocutor is very important.

As an interlocutor, he always provides a new perspective.

He is suspected to be the ringleader of the incident.

He is a complete outsider to this issue.

He is the best defender of our team.

He was able to surpass the achievements of his predecessor.

The police are continuing to search for the missing person.

We are looking for a new supplier.

He was a misanthrope, avoiding interaction with people.