Friendship is what is in the middle of people. Holding them together.
:the extent of one's friendship (as in, 仲がいい or 仲が悪い）
friendship, OR membership in a group (i.e. working for the same company).
You'll also hear things like this: "The squid is the octopus' 仲間."
|ｘｘｘ と 仲直り する||
to make up with XXX
, to restore a friendship