Agony
Part of speech: noun
Definition: Violent contest or striving. Pain so extreme as to cause writhing or contortions of the body, similar to those made in the athletic contests in Greece; and hence, extreme pain of mind or body; anguish; paroxysm of grief; specifically, the sufferings of Christ in the garden of Gethsemane. Paroxysm of joy; keen emotion. The last struggle of life; death struggle.
Example sentence: Only in the agony of parting do we look into the depths of love.
Excruciation
Part of speech: noun
Definition: Some excruciating pain.