A person or thing that disturbs; something that causes disruption or interruption.
From disturb + -er suffix (Old English -ere, from Latin -arius). The -er suffix productively creates agent nouns from verbs in English.
The -er suffix is so powerful that almost any verb can become 'a [verb]-er person': fighter, runner, disturber—yet some feel natural ('fighter') while others feel awkward ('disturber'), showing that word formation rules exist alongside usage patterns.
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