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Changer

usgb/ˈtʃeɪndʒər/Volume
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Physical ObjectsPlay
Changer often refers to devices used to replace or switch items, like coins. SlideI need a dollar in quarters; let's use the coin changer.
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Abstract ConceptsPlay
Can also mean someone who changes ideas, not just physical things. SlideHis approach as a policy changer was revolutionary.
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Neutral TermPlay
Changer on its own is neutral, not implying good or bad alterations. SlideAs a climate changer, humans have a big impact on the planet.