The word "changer" refers to something or someone that modifies, alters, or transforms things. It can indicate a person who brings about change or a device that switches or modifies something. Full definition
If these challenges are met with commitment to sourcing and eating real food, it's a game changer for life. (wowpowerwalking.com)
This one is the real game changer for teachers. (edutopia.org)
However, due to the system's increased complexity, the navigation package features a single - disc CD slot and a six - disc CD changer in the center console. (cnet.com)