inheritor
/ɪnˈhɛrɪtər/Definitions
1. noun
A person who inherits property, money, or a title upon the death of another person
“She was the main inheritor of her father’s vast fortune.”
2. noun
A person who receives or assumes an office, title, or position by succession or inheritance
“He became the inheritor of the company’s CEO position after his predecessor’s retirement.”