Federation of Young European Greens was created in 1988.

The best greens to feed a turtle are collard greens, mustard greens and kale.

There is no standard collective noun for the noun greens, in which case a noun that suits the situation can be used; for example a bunch of greens, a bowl of greens, an expanse of greens, etc.

Another name for these greens is called SandFire greens

The federation army is approaching fast.

By the order of the federation, you are under arrest.

The writer's federation isn't what it used to be.