different between savagery vs barbarianism

English

savagery (countable and uncountable, plural savageries)

(uncountable) Savage or brutal behaviour; barbarity.
(countable) A violent act of cruelty.
Savages collectively; the world of savages.
(uncountable) Wild growth of plants.
- 1990, Brian Leverett, Water Gardens: Step-By-Step to Success (page 9)
  […] they […] made, amongst other features, lead ponds. With their departure these lands once more reverted to savagery; gardening, along with virtually all aspects of culture, disappeared and with it the man-made water gardens.

barbarian +? -ism

barbarianism (countable and uncountable, plural barbarianisms)

A primitive or simplistic ethos or societal condition; barbarism.
Some postulate that after a nuclear war, humanity would fall into a state of barbarianism.
Behaviour appropriate to a barbarian, that is uncivilized, brutal, or crude.
The teacher accused the bullies of barbarianism when she caught them taunting the girl in a wheelchair.

(primitive ethos or societal condition): degeneracy, reductionism, savagery, state of nature, simplicity
(behaviour of a barbarian): degeneracy, rudeness, savagery, wildness, unsophistication

Send