Someone or something that deranges; a person or force that causes disorder or mental disturbance.
From 'derange' + the suffix '-er' (meaning 'one who does' or 'that which causes'). This agentive suffix creates nouns describing the source or cause of an action.
While most '-er' words describe people we admire (teacher, builder, helper), a 'deranger' is someone actively making things worse—it's a word that reveals what people of that era feared most: chaos and people who caused it.
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