Annihilation
Part of speech: noun
Definition: The act of reducing to nothing, or nonexistence; or the act of destroying the form or combination of parts under which a thing exists, so that the name can no longer be applied to it; as, the annihilation of a corporation. The state of being annihilated. The process of a particle and its corresponding antiparticle combining to produce energy.
Example sentence: Probably the simplest hypothesis... is that there may be a slow process of annihilation of matter.
Disintegration
Part of speech: noun
Definition: A process by which anything disintegrates.The condition of anything which has disintegrated.A wearing away or falling to pieces of rocks or strata, produced by atmospheric action, frost, ice, etc.
Example sentence: There's such cultural rot taking place, such a disintegration throughout our culture. Values, morality, you name it. Standards have been relaxed, and people are not being held to them. People's intentions, if they're said to be good and honorable, that's all that matters.