I have multiple circles of friends.

They became fast friends after meeting at the conference.

I have many flu friends.

I went to a party with some friends of mine.

We invited some friends of ours to the party.

I have a group of monthly friends that I meet up with every month.

I have many mouth-friends who always support me.

I have many pen friends from different countries.

Plumber's friends are essential tools for fixing pipes.

I have many pen-friends from different countries.