annihilation

As nouns the difference between annihilation and massacre

is that annihilation is 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 while massacre is the intentional killing of a considerable number of human beings, under circumstances of atrocity or cruelty, or contrary to the norms of civilized people.

As a verb massacre is

to kill in considerable numbers where much resistance can not be made; to kill with indiscriminate violence, without necessity, and contrary to the norms of civilized people; to butcher; to slaughter. Often limited to the killing of human beings.

As a noun annihilation

is annihilation.

As an adjective annihilatory is

causing annihilation.

In physics terms the difference between annihilation and coannihilation

is that annihilation is the process of a particle and its corresponding antiparticle combining to produce energy while coannihilation is the mutual annihilation of a pair of colliding particles.

As nouns the difference between annihilation and coannihilation

is that annihilation is 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 while coannihilation is the mutual annihilation of a pair of colliding particles.

As nouns the difference between annihilation and bumwhush

is that annihilation is annihilation while bumwhush is obscurity, ruin, annihilation.