ANNIHILATE

Entrain :climb, ascend, climb up, entrain, board, mount.
Forward :toward the front; in the direction that one is facing or traveling.
Testify :give evidence as a witness in a law court.
Destroy :put an end to the existence of (something) by damaging or attacking it.
Annihilate : to reduce to utter ruin or nonexistence; destroy utterly
So, Synonym of Annihilate is Destroy.