The word tamperer is often used to describe someone who interferes with something, often with the intention of causing damage or altering the outcome. Some common synonyms for tamperer include meddler, interferer, and manipulator. Other synonyms include snoop, spy, or intruder, which suggest a more secretive or underhanded approach. The words tamper and interfere are often used interchangeably and can be replaced with words such as meddle, tinker, or muck around with. Overall, these synonyms describe individuals who manipulate a situation for their own benefit, often at the expense of others.