F.r.i.e.n.d

Must friend: a best friend, a member of your inner circle, a person you count on when something big happens in your life

Trust friend: a friend who shows integrity, someone you feel comfortable with, that you’re always glad to see, but not in your inmost circle; perhaps someone you’d like to be closer to, if you had the time or opportunity

Rust friend: a person you’ve known for a long, long time; you’re probably not going to get any closer to that person, unless something changes, but a part of your life

Just friends: a person you see — at a weekly poker game, at your child’s school — who is enjoyable company, but you have no desire to socialize outside a specific context or to get to know that person better