A person or thing that creates disorder, messiness, or confusion; something that disrupts organization.
From disorder (verb) + -er (agent suffix meaning 'one who does'). The word literally means 'one who disorders' or creates disarray.
This word almost never appears in modern English because 'troublemaker' or 'someone who messes things up' sounds more natural—yet the logical structure (verb + -er) is pure English word-building.
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