berserker

Words with a similar base: berserker

'berserker'

[berserker.n.01] as in: one of the ancient Norse warriors legendary for working themselves into a frenzy before a battle and fighting with reckless savagery and insane fury

'berserker'

[amuck.s.01] as in: frenzied as if possessed by a demon

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Examples:
the soldier was completely amuck
berserk with grief
a berserk worker smashing windows