different between confederacy vs combining

English

Anglo-Norman confederacie, from Latin confoederatio.

confederacy (plural confederacies)

An alliance.
(politics) A state where the sovereign constituent units delegate their authority to the centre. As opposed to a federation, where the central and regional governments are each equal and sovereign in their own sphere.
Specifically, an instance of a decentralized governing structure among the indigenous peoples of North America.

combining

combining (plural combinings)

The act by which things are combined or brought together.
- 1840-41, Charles Dickens, The Old Curiosity Shop
  these little combinings together, of friends, for objects in themselves extremely laudable, but which the law terms conspiracies

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