usurper
🇺🇸
/juːˈzɜːrpər/
🇬🇧
/juːˈzɜːpə(r)/
someone who takes control of a position or power without having the right to do so
The people were angry at the usurper who seized the throne without any right.
人々は、権利を持っていないのに玉座を奪った簒位者に怒りました。