usurper

A usurper is someone who wrongfully takes someone else's place. A usurper usually tries to take someone's place on the throne, rather than someone's seat on a bus.

If you were married, and someone cheated with your spouse and then married your spouse, you would probably consider that person a usurper: someone who took your place in a way that's shady or wrong. A king who is overthrown would consider the new king a usurper. Usurper is a strong word for someone who has taken or usurped what rightfully belonged to someone else.

Definitions of usurper
1

n one who wrongfully or illegally seizes and holds the place of another

Synonyms:
supplanter
Types:
claim jumper
one who illegally occupies property to which another has a legal claim
Type of:
offender, wrongdoer
a person who transgresses moral or civil law

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