We take a specific need to God and charge him with the responsibility of meeting it. Prayers are ordinary requests. Supplications are unique, special requests. Ordinary prayers are presented without a great deal of emotional steam. No one is sick or about to die.
Supplication is another matter.
Supplication is earnest entreaty about a special need. We are not sure whether God is going to bring our husband through surgery. Supplication is a special privilege of prayer to meet special needs. We thank God for the privilege of prayer and for answered prayer. Thanksgiving verifies capacity of soul to appreciate God.