Changer
Definition 1 of 3

Physical Objects
Changer often refers to devices used to replace or switch items, like coins.

I need a dollar in quarters; let's use the coin changer.
Abstract Concepts
Can also mean someone who changes ideas, not just physical things.

His approach as a policy changer was revolutionary.
Neutral Term
Changer on its own is neutral, not implying good or bad alterations.

As a climate changer, humans have a big impact on the planet.
Compare with
modifier
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