What is the difference between excretion and defecation?

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Excretion: Excretion is the process of eliminating waste products of metabolism and other non-useful materials. In humans, the two major excretory processes are the formation of urine in the kidneys and the formation of carbon dioxide (a human's abundant metabolic waste) molecules as a result of respiration, which is then exhaled from the lungs. These waste products are eliminated by urination and exhalation respectively

Defecation: Defecation is the final act of digestion by which organisms eliminate solid, semisolid or liquid waste material (feces) from the digestive tract via the anus. Humans expel feces with a frequency varying from a few times daily to a few times weekly. Waves of muscular contraction known as peristalsis in the walls of the colon move fecal matter through the digestive tract towards the rectum. Undigested food may also be expelled this way; this process is called egestion.

More simply: Excretion is the disposal of nitrogen-containing waste products of metabolism. Elimination (same as Defecation): is the passing of undigested materials out of the digestive compartment.