RhymeZone: annihilationist definitions

Definitions of annihilationist:

noun: A person who believes in annihilationism: that eternal punishment is the annihilation of both the body and the soul.
noun: A person who advocates or practices annihilationism (the annihilation of a group): an eliminationist.
adjective: Advocating annihilationism; advocating the annihilation of a group of people.

(Definitions from Wiktionary)