W: (n) ouster [Related to: oust] (a person who ousts or supplants someone else)
W: (n) ousting [Related to: oust] (the act of ejecting someone or forcing them out)
W: (n) expulsion [Related to: expel] (the act of forcing out someone or something) "the ejection of troublemakers by the police"; "the child's expulsion from school"