Prayer
You pray for something that you want.
Worship
You worship God who is the Perfect One, having no specific request to put before Him. You devote yourself blindly and submissively to His work and guidance. You neither will nor can nor dare to have any will of your own.
Worship is the most perfect form of prayer. You worship when you neither dare to nor want to have an opinion. It is perfect submission under God’s decrees.
When you pray, you want to accomplish something. When you worship, there is nothing that you want to accomplish.