changer
n. countable B1 Intermediate US //ˈtʃeɪndʒɝ// UK //tʃˈeɪndʒɐ// chang·er
n. a person or thing that makes something different. You use this word when someone or something causes a change in a situation.
n. a person or agent responsible for bringing about a change or transformation.
The new manager is a real changer.
The invention of the internet was a major changer in how we communicate with friends.
In the history of science, the scientist is often viewed as a changer of paradigms, shifting our fundamental understanding of the natural world.
Inherited from Middle English chaungere, chaungeour (“moneychanger”); equivalent to change + -er.